diff --git a/service/marketSources/cevemarket.py b/service/marketSources/cevemarket.py
index fdc02a0d5..ac8d98d93 100644
--- a/service/marketSources/cevemarket.py
+++ b/service/marketSources/cevemarket.py
@@ -31,6 +31,7 @@ pyfalog = Logger(__name__)
 
 
 class CEveMarketBase:
+
     @staticmethod
     def fetchPrices(priceMap, fetchTimeout, system=None, serenity=False):
         params = {'typeid': {typeID for typeID in priceMap}}
@@ -52,10 +53,6 @@ class CEveMarketBase:
             except (TypeError, ValueError):
                 pyfalog.warning('Failed to get price for: {0}', type_)
                 continue
-
-            # Price is 0 if evemarketer has info on this item, but it is not available
-            # for current scope limit. If we provided scope limit - make sure to skip
-            # such items to check globally, and do not skip if requested globally
             if percprice == 0 and system is not None:
                 continue
             priceMap[typeID].update(PriceStatus.fetchSuccess, percprice)
@@ -63,7 +60,9 @@ class CEveMarketBase:
 
 
 class CEveMarketTq(CEveMarketBase):
-    name = 'www.ceve-market.org (Tranquility)' #let me at last
+
+    name = 'www.ceve-market.org (Tranquility)'
+    group = 'tranquility'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
@@ -72,8 +71,11 @@ class CEveMarketTq(CEveMarketBase):
         if priceMap:
             self.fetchPrices(priceMap, max(fetchTimeout / 3, 2), serenity=False)
 
+
 class CEveMarketCn(CEveMarketBase):
-    name = 'www.ceve-market.org (Serenity)' #let me at last
+
+    name = 'www.ceve-market.org (Serenity)'
+    group = 'serenity'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
@@ -82,5 +84,6 @@ class CEveMarketCn(CEveMarketBase):
         if priceMap:
             self.fetchPrices(priceMap, max(fetchTimeout / 3, 2), serenity=True)
 
+
 Price.register(CEveMarketCn)
 Price.register(CEveMarketTq)
diff --git a/service/marketSources/evemarketdata.py b/service/marketSources/evemarketdata.py
index 94421e1e1..6f88499d0 100644
--- a/service/marketSources/evemarketdata.py
+++ b/service/marketSources/evemarketdata.py
@@ -32,6 +32,7 @@ pyfalog = Logger(__name__)
 class EveMarketData:
 
     name = 'eve-marketdata.com'
+    group = 'tranquility'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
diff --git a/service/marketSources/evemarketer.py b/service/marketSources/evemarketer.py
index 372d0012c..0af18bb4e 100644
--- a/service/marketSources/evemarketer.py
+++ b/service/marketSources/evemarketer.py
@@ -32,6 +32,7 @@ pyfalog = Logger(__name__)
 class EveMarketer:
 
     name = 'evemarketer'
+    group = 'tranquility'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
diff --git a/service/marketSources/evepraisal.py b/service/marketSources/evepraisal.py
index 66dd5b1f0..8650a2379 100644
--- a/service/marketSources/evepraisal.py
+++ b/service/marketSources/evepraisal.py
@@ -38,6 +38,7 @@ systemAliases = {
 class EvePraisal:
 
     name = 'evepraisal'
+    group = 'tranquility'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
diff --git a/service/marketSources/fuzzwork.py b/service/marketSources/fuzzwork.py
index 19d20089e..07a61e61d 100644
--- a/service/marketSources/fuzzwork.py
+++ b/service/marketSources/fuzzwork.py
@@ -39,6 +39,7 @@ locations = {
 class FuzzworkMarket:
 
     name = 'fuzzwork market'
+    group = 'tranquility'
 
     def __init__(self, priceMap, system, fetchTimeout):
         # Try selected system first
diff --git a/service/price.py b/service/price.py
index 14623bbe0..f04309ae0 100644
--- a/service/price.py
+++ b/service/price.py
@@ -106,6 +106,9 @@ class Price:
         # attempt to find user's selected price source, otherwise get first one
         sourceAll = list(cls.sources.keys())
         sourcePrimary = sFit.serviceFittingOptions["priceSource"] if sFit.serviceFittingOptions["priceSource"] in sourceAll else sourceAll[0]
+        # When we have picked primary source, make sure to include only sources from the same group to avoid fetching
+        # tranquility data for serenity or vice versa
+        sourceAll = list(n for n, s in cls.sources.items() if s.group == cls.sources[sourcePrimary].group)
 
         # Format: {source name: timeout weight}
         sources = {sourcePrimary: len(sourceAll)}