PriceAdvance makes online comparison shopping very easy. Download the extension (available for both Firefox and IE) and then visit one of the partner sites to find an item including, Amazon, Abt.com, Best Buy, Buy.com, Circuit City, Computers4Sure, eBooks.com, JR.com, Kmart, mwave.com, nothingbutsoftware.com, Sears, Target, TechDepot.com, TigerDirect and Walmart. Once you find something you like, click on the product description. At the bottom right of your window, you'll see PriceAdvance and a listing of how many comparison prices were found. If the window does not pop-up automatically, click the icon and you'll see a window listing alternative retailers and their price for the same item. Click on the price you like and be taken to that website. Not all items will have comparisons, but the majority of what we tested did. It's a nice add-on that can save you time and money!