KeepCash

Check to see if online coupons are available for the store you are shopping in. Compare the price of in-store purchases against potential savings with KeepCash’s iPhone coupon check. The iPhone interface lets you quickly search or scroll to find the store of your interest and see which online coupons and promotional offers are currently available. It might just be cheaper to buy a product online by using an online coupon instead of paying the full retail price for it in the store.

http://www.keepcash.com/iphone/