If you want find out where to buy a particular book at the lowest cost, try out Best Book Deal. This service will search 100 bookstores, and show you how the prices compare. A very handy feature of this site is the inclusion of the shipping costs to calculate a total price. So, at a glance, you can see which bookstore will give you the lowest total price. It also includes the condition of the book (for used books) and the type of shipping that will be used.