A few apps that I’ve tried in the past week and have saved me a few bucks.
Great search results, with great options to scan something in.
Key Ring: Cards Coupon & Sales
Keep your keys in your pocket and your reward cards on your phone. Please read instructions carefully. Does not work with all store scanner types.
ShopSavvy Barcode & QR Scanner
Like google shopper but promising crowdsourced info and better search results.