No one wants to buy something only to find out it was cheaper somewhere else. It's better if you can get a summary of prices before you spend your hard-earned cash. That way, you can save yourself money, and the hassle of all that comparison shopping.
That's why sites like PriceGrabber are so popular. Now, the PriceGrabber app gives you the same functionality as the website.
Simply scan the bar code of a product with your phone's camera. PriceGrabber displays stores selling the scanned item, as well as the price at each location.
You also get features like BottomLinePrice, which shows you the entire cost, including tax and shipping. More entertaining is Gift Shaker: Just shake your phone, and it will randomly suggest a gift to buy.