diff --git a/GameData/RP-1/Tree/TREE-Engines.cfg b/GameData/RP-1/Tree/TREE-Engines.cfg
index 9189ddac4fc..1b9115ccaf1 100644
--- a/GameData/RP-1/Tree/TREE-Engines.cfg
+++ b/GameData/RP-1/Tree/TREE-Engines.cfg
@@ -45,7 +45,7 @@
             @CONFIG[11D417B]
             {
                 %techRequired = lunarLanding
-                %cost = -79
+                %cost = 0
             }
 
             @CONFIG[11D423]
@@ -3203,21 +3203,21 @@
             @CONFIG[RD-0212]
             {
                 %techRequired = stagedCombustion1967
-                %cost = 36
+                %cost = 24
                 *@PARTUPGRADE[RFUpgrade_RD-0212]/deleteme -= 1
             }
 
             @CONFIG[RD-0212-Mk2]
             {
                 %techRequired = stagedCombustion1976
-                %cost = 41
+                %cost = 26
                 *@PARTUPGRADE[RFUpgrade_RD-0212-Mk2]/deleteme -= 1
             }
 
             @CONFIG[RD-0212-Mk3]
             {
                 %techRequired = stagedCombustion1992
-                %cost = 41
+                %cost = 26
                 *@PARTUPGRADE[RFUpgrade_RD-0212-Mk3]/deleteme -= 1
             }
 
@@ -3993,14 +3993,14 @@
             @CONFIG[RD-855]
             {
                 %techRequired = orbitalRocketry1964
-                %cost = 22
+                %cost = 6
                 *@PARTUPGRADE[RFUpgrade_RD-855]/deleteme -= 1
             }
 
             @CONFIG[RD-856]
             {
                 %techRequired = orbitalRocketry1964
-                %cost = -2
+                %cost = -1
                 *@PARTUPGRADE[RFUpgrade_RD-856]/deleteme -= 1
             }
 
diff --git a/GameData/RP-1/Tree/TREE-Parts.cfg b/GameData/RP-1/Tree/TREE-Parts.cfg
index 31d53d6b036..2ae920cd9fa 100644
--- a/GameData/RP-1/Tree/TREE-Parts.cfg
+++ b/GameData/RP-1/Tree/TREE-Parts.cfg
@@ -201,7 +201,7 @@
 @PART[ALV_3_Engine_1]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1963
-    %cost = 435
+    %cost = 526
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Tantares LV mod</color></b>
@@ -5593,7 +5593,7 @@
 @PART[RLA_mp_small_radial]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1963
-    %cost = 91
+    %cost = 23
     %entryCost = 0
     RP0conf = false
     @description ^=:$: <b><color=green>From RLA Stockalike mod</color></b>
@@ -11590,7 +11590,7 @@
 @PART[ROE-RD0212]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1963
-    %cost = 435
+    %cost = 526
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEngines mod</color></b>
@@ -11612,7 +11612,7 @@
 @PART[ROE-RD0214]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1963
-    %cost = 91
+    %cost = 23
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEngines mod</color></b>
@@ -11932,7 +11932,7 @@
 @PART[ROE-RD8]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1981
-    %cost = 194
+    %cost = 49
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEngines mod</color></b>
@@ -11943,7 +11943,7 @@
 @PART[ROE-RD855]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 96
+    %cost = 24
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEngines mod</color></b>
@@ -11954,7 +11954,7 @@
 @PART[ROE-RD856]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 50
+    %cost = 13
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEngines mod</color></b>
@@ -13216,7 +13216,7 @@
 @PART[ROEE-RD0230]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1972
-    %cost = 100
+    %cost = 25
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEnginesExtended mod</color></b>
@@ -13238,7 +13238,7 @@
 @PART[ROEE-RD0236]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1972
-    %cost = 90
+    %cost = 23
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEnginesExtended mod</color></b>
@@ -13272,7 +13272,7 @@
 @PART[ROEE-RD864]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1976
-    %cost = 163
+    %cost = 41
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From ROEnginesExtended mod</color></b>
@@ -26205,7 +26205,7 @@
 @PART[radialLiquidEngine1-2]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 96
+    %cost = 24
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Stock (RO Config) mod</color></b>
@@ -27344,7 +27344,7 @@
 @PART[rn_dnepr1_rd0255_vernier]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1986
-    %cost = 100
+    %cost = 25
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From RN Soviet Rockets mod</color></b>
@@ -30541,7 +30541,7 @@
 @PART[smallRadialEngine]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 50
+    %cost = 13
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Stock (RO Config) mod</color></b>
@@ -32340,7 +32340,7 @@
 @PART[tantares_lv_engine_rd_855_s0_1]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 96
+    %cost = 24
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Tantares LV mod</color></b>
@@ -32351,7 +32351,7 @@
 @PART[tantares_lv_engine_rd_856_s0_1]:FOR[xxxRP0]
 {
     %TechRequired = orbitalRocketry1961
-    %cost = 50
+    %cost = 13
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Tantares LV mod</color></b>
@@ -32362,7 +32362,7 @@
 @PART[tantares_lv_engine_rd_8_s0_1]:FOR[xxxRP0]
 {
     %TechRequired = stagedCombustion1981
-    %cost = 194
+    %cost = 49
     %entryCost = 0
     RP0conf = true
     @description ^=:$: <b><color=green>From Tantares LV mod</color></b>
diff --git a/Source/Tech Tree/Parts Browser/data/Engine_Config.json b/Source/Tech Tree/Parts Browser/data/Engine_Config.json
index 181ea86d027..52b5fd35a1e 100644
--- a/Source/Tech Tree/Parts Browser/data/Engine_Config.json	
+++ b/Source/Tech Tree/Parts Browser/data/Engine_Config.json	
@@ -92,7 +92,7 @@
         "title": "11D417B",
         "description": "",
         "mod": "Engine_Config",
-        "cost": -79,
+        "cost": 0,
         "entry_cost": 0,
         "category": "EDL",
         "info": "",
@@ -10664,7 +10664,7 @@
         "title": "RD-0212",
         "description": "",
         "mod": "Engine_Config",
-        "cost": 36,
+        "cost": 24,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -10686,7 +10686,7 @@
         "title": "RD-0212-Mk2",
         "description": "",
         "mod": "Engine_Config",
-        "cost": 41,
+        "cost": 26,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -10708,7 +10708,7 @@
         "title": "RD-0212-Mk3",
         "description": "",
         "mod": "Engine_Config",
-        "cost": 41,
+        "cost": 26,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -13237,7 +13237,7 @@
         "title": "RD-855",
         "description": "",
         "mod": "Engine_Config",
-        "cost": 22,
+        "cost": 6,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
@@ -13259,7 +13259,7 @@
         "title": "RD-856",
         "description": "",
         "mod": "Engine_Config",
-        "cost": -2,
+        "cost": -1,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
diff --git a/Source/Tech Tree/Parts Browser/data/RLA_Stockalike.json b/Source/Tech Tree/Parts Browser/data/RLA_Stockalike.json
index d5f04170349..e9fdf7c0ae1 100644
--- a/Source/Tech Tree/Parts Browser/data/RLA_Stockalike.json	
+++ b/Source/Tech Tree/Parts Browser/data/RLA_Stockalike.json	
@@ -260,7 +260,7 @@
         "title": "RD-0214",
         "description": "A vernier engine cluster found on the third stage of the Proton series launcher. Diameter: [3.78 m]. Plume configured by RealPlume.",
         "mod": "RLA Stockalike",
-        "cost": 91,
+        "cost": 23,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
diff --git a/Source/Tech Tree/Parts Browser/data/RN_Soviet_Rockets.json b/Source/Tech Tree/Parts Browser/data/RN_Soviet_Rockets.json
index b369807cd2b..78368190967 100644
--- a/Source/Tech Tree/Parts Browser/data/RN_Soviet_Rockets.json	
+++ b/Source/Tech Tree/Parts Browser/data/RN_Soviet_Rockets.json	
@@ -464,7 +464,7 @@
         "title": "RD-0257 Vernier",
         "description": "RD-0257 vernier engine for second stage of the Dnepr 1 rocket. Plume configured by RealPlume.",
         "mod": "RN Soviet Rockets",
-        "cost": 100,
+        "cost": 25,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
diff --git a/Source/Tech Tree/Parts Browser/data/ROEngines.json b/Source/Tech Tree/Parts Browser/data/ROEngines.json
index adbfe47d6cf..09ede6cb31d 100644
--- a/Source/Tech Tree/Parts Browser/data/ROEngines.json	
+++ b/Source/Tech Tree/Parts Browser/data/ROEngines.json	
@@ -5078,7 +5078,7 @@
         "title": "RD-0212",
         "description": "",
         "mod": "ROEngines",
-        "cost": 435,
+        "cost": 526,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -5127,7 +5127,7 @@
         "title": "RD-0207/0214",
         "description": "",
         "mod": "ROEngines",
-        "cost": 91,
+        "cost": 23,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -5839,7 +5839,7 @@
         "title": "RD-8",
         "description": "A single-chamber derivative of the RD-8 engine used on the Zenit second stage. Yuzhnoye Design Office concept, featuring dual-axis gimbal control and restart capability for use in upper stages. Diameter: 0.5 m. Plume configured by RealPlume.",
         "mod": "ROEngines",
-        "cost": 194,
+        "cost": 49,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -5863,7 +5863,7 @@
         "title": "RD-851/855",
         "description": "",
         "mod": "ROEngines",
-        "cost": 96,
+        "cost": 24,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "Engine",
@@ -5887,7 +5887,7 @@
         "title": "RD-852/856",
         "description": "",
         "mod": "ROEngines",
-        "cost": 50,
+        "cost": 13,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "Engine",
diff --git a/Source/Tech Tree/Parts Browser/data/ROEnginesExtended.json b/Source/Tech Tree/Parts Browser/data/ROEnginesExtended.json
index 8587093d9d7..d5b4676c647 100644
--- a/Source/Tech Tree/Parts Browser/data/ROEnginesExtended.json	
+++ b/Source/Tech Tree/Parts Browser/data/ROEnginesExtended.json	
@@ -688,7 +688,7 @@
         "title": "RD-0230",
         "description": "",
         "mod": "ROEnginesExtended",
-        "cost": 100,
+        "cost": 25,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -736,7 +736,7 @@
         "title": "RD-0236",
         "description": "",
         "mod": "ROEnginesExtended",
-        "cost": 90,
+        "cost": 23,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -809,7 +809,7 @@
         "title": "RD-864",
         "description": "",
         "mod": "ROEnginesExtended",
-        "cost": 163,
+        "cost": 41,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
diff --git a/Source/Tech Tree/Parts Browser/data/Stock__RO_Config.json b/Source/Tech Tree/Parts Browser/data/Stock__RO_Config.json
index 075086ae351..297e29f5e86 100644
--- a/Source/Tech Tree/Parts Browser/data/Stock__RO_Config.json	
+++ b/Source/Tech Tree/Parts Browser/data/Stock__RO_Config.json	
@@ -6640,7 +6640,7 @@
         "title": "RD-851/855 [Radial]",
         "description": "Vernier thruster used on the first stage of the Tsyklon rocket. Diameter: [0.3 m]. Plume configured by RealPlume.",
         "mod": "Stock (RO Config)",
-        "cost": 96,
+        "cost": 24,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
@@ -7186,7 +7186,7 @@
         "title": "RD-852/856 [Radial]",
         "description": "Vernier thruster used on the second stage of the Tsyklon rocket. Diameter: [0.3 m]. Plume configured by RealPlume.",
         "mod": "Stock (RO Config)",
-        "cost": 50,
+        "cost": 13,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
diff --git a/Source/Tech Tree/Parts Browser/data/Tantares_LV.json b/Source/Tech Tree/Parts Browser/data/Tantares_LV.json
index 7a0271d1c4a..5aa0a2af92c 100644
--- a/Source/Tech Tree/Parts Browser/data/Tantares_LV.json	
+++ b/Source/Tech Tree/Parts Browser/data/Tantares_LV.json	
@@ -28,7 +28,7 @@
         "title": "RD-0212",
         "description": "",
         "mod": "Tantares LV",
-        "cost": 435,
+        "cost": 526,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",
@@ -413,7 +413,7 @@
         "title": "RD-851/855",
         "description": "",
         "mod": "Tantares LV",
-        "cost": 96,
+        "cost": 24,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
@@ -437,7 +437,7 @@
         "title": "RD-852/856",
         "description": "",
         "mod": "Tantares LV",
-        "cost": 50,
+        "cost": 13,
         "entry_cost": 0,
         "category": "ORBITAL",
         "info": "",
@@ -461,7 +461,7 @@
         "title": "RD-8",
         "description": "",
         "mod": "Tantares LV",
-        "cost": 194,
+        "cost": 49,
         "entry_cost": 0,
         "category": "STAGED",
         "info": "",