Responsible consumers check around for the lowest prices before taking the plunge on a purchase. This oddly named app for iPhone helps you find the biggest deals at Amazon.com based on the price slash percentage. You can also select items by category to narrow your search for hot deals. Our only warning is that items come up in a long list with thumbnails, so loading might take a while if you're not within high-speed Wi-Fi range.
iPhone Link: http://chunklove.com/