Grocery Coupons As convenience to our users, 3Magpies provides SmartSource Coupons. SmartSource printable coupons should be redeemable at any store that accepts regular coupons -- after all, they are the same company that puts those regular coupons in the Sunday paper! News America Marketing has relationships with most retail chains who understand this. Unfortunately, sometimes local store managers make their own policies. If a store manager does not accept our coupons, please present this letter which explains how SmartSource is a leading provider of valid printable coupons.