True story: when I'm out shopping, before I make an impulse by I compulsively check what Product X goes for on Amazon. Which is why being able to scan bar codes from the Amazon app is a major time-saving win.
I know, I know, there are bar code scanning apps that I could use to price compare. But Amazon's consistently as or less expensive than just about anywhere, and more importantly I trust them, as a vendor. No more typing in product names! Lots more pointing my phone at random objects in stores. [iTunes]