I really like to use amazon.com. I feel like I am on this site for almost everything. It not only has books but music, movies and much more. The site is really easy to use and is set up really professional. My favorite aspect of this site is that when you click on an item it suggests things that other people have bought when they bought the current item. Once you have been on the site, it remember items you have viewed and on the homepage it will suggest items you may like when you return.
http://www.amazon.com/
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