Take the UPCZilla app shopping with you, scan bar codes from products and compare prices with eBay, Amazon and others to see if you can get them cheaper online! The stores hate this money-saving app :). UPCZilla is incredibly simple: as you shop in a physical store you can scan bar codes from products you are interested in and within seconds find the lowest price for the same item on eBay, Amazon and other stores, compare prices amongst the online retailers and get other info such as price hist