diff --git a/app/controllers/shop/orders_controller.rb b/app/controllers/shop/orders_controller.rb
index 11b914eb0..cd81ae104 100644
--- a/app/controllers/shop/orders_controller.rb
+++ b/app/controllers/shop/orders_controller.rb
@@ -97,6 +97,10 @@ def create
         current_user.lock!
         @shop_item.lock! if @shop_item.limited?
 
+        # recalc mod prices after lock so theyre fresh
+        modifiers_total = @modifiers.sum { |m| m.price_for_region(region) }
+        total_cost = item_total + accessories_total + modifiers_total
+
         if @mission_submission.nil?
           user_balance = current_user.balance
           if total_cost > user_balance
diff --git a/app/models/shop_order.rb b/app/models/shop_order.rb
index b2ba1d4a6..254561fde 100644
--- a/app/models/shop_order.rb
+++ b/app/models/shop_order.rb
@@ -377,7 +377,9 @@ def check_user_balance
     return if redeeming_mission_submission.present?
     return unless frozen_item_price&.positive? && quantity.present?
 
-    total_cost_for_validation = frozen_item_price * quantity
+    # include modifier costs in the balance check
+    modifier_cost = frozen_modifiers_price || 0
+    total_cost_for_validation = (frozen_item_price * quantity) + modifier_cost
     if user&.balance&.< total_cost_for_validation
       shortage = total_cost_for_validation - (user.balance || 0)
       errors.add(:base, "Insufficient balance. You need #{shortage} more tickets.")