This website tells you where you can sell your books back and get the best price!
eCampus.com - Sell Textbooks
BookScouter: sell textbooks online
A list of places to sell your used fiction and textbooks online and offline.
How to make money buying used books on ebay and then selling them to a buy back program...I think I'm going to try this!
Sell Textbooks Online - Get Cash for Used Textbooks
Free College Textbooks Free Online Textbook List - hundreds of free online college textbook links organized by subject matter