Amazon App for BlackBerry
It's tempting to grab an item in a brick-and-mortar store simply because it's there. If you have a touch more patience, however, the Amazon Mobile App for BlackBerry (or the Amazon Mobile App for iPhone) may be the perfect shopping companion for you. Snap a picture of the item you want to buy, and Amazon Mobile will automatically recognize the product and show you how much it costs on Amazon. (And then let you buy it, of course.)
Note: This link takes you to the vendor's site, where you can download the latest version of the software.