From Growth Systems:
The Sea is a revolutionary new app that will completely streamline all your price comparison shopping. (and make your life a little easier). The Sea installs into your favorite search engine, replaces the right-column ads, and offers you a one-click option for finding the best price. Whether you are searching for electronics, shoes, books, or even travel, you can get the results - and the prices - you need within seconds. The days of long, intensive price comparison shopping are gone. With The Sea you have a simple price comparison tool that is not only intelligent and lightening fast, but will also improves with every search.
What's new in this version:
Version 1.6.3 added support for Chrome and Internet Explorer.
I love this product, it helps me find the best products across lots of different sites, not only that, I have been using it more and more to find hotels and air travel tickets. It also doesn't get in the way of the regular search content!
I cannot really find any cons... I use firefox, so I can install it right into my browser.