diff --git a/core/shipping.py b/core/shipping.py
index 60eff27..1aad958 100644
--- a/core/shipping.py
+++ b/core/shipping.py
@@ -62,9 +62,9 @@ def get_shipping_cost(total_weight, postal_code):
     else:
         container = "large_flat_rate_box"
 
-    shipping_cost = get_quote(postal_code, total_weight, container)
+    shipping_cost = get_quote(postal_code, str(total_weight.lb), container)
 
-    return shipping_cost
+    return Decimal(shipping_cost)
 
 
 def build_usps_rate_request(weight, container, zip_destination):