It's almost time for summer school, and we all want to get the best deal for our textbooks. CollegeSwapShop.com searches the web and finds different sites where books are sold to compare for you. Simply type in the ISBN number and BAM you have options. It does all the seraching and comparing for you.
AND it's not just for textbooks, it will search and ISBN.
I added a widget (right below my avatar) for easy use.