Price Check by AOL 2.4.1.1

Price Check is a Firefox & Internet Explorer extension that shows you the best price for products you're viewing – and it works on hundreds of sites, including Amazon, Best Buy and Buy.com (and the number is growing almost daily!).

You can continue to shop as you always have, on the sites you love to use, and Price Check does the comparison shopping for you. It is bargain shopping simplified, and without the hassle of coupons or codes.