I would agree that Amazon is a great place to buy college textbooks. There are several websites that buy/sell used college books. You can save a lot of money versus buying in the campus bookstore. But always remember to buy the exact edition that is on your syllabus and any of the supplements if the professor is requiring. For example, I purchased a used book online but it didn't have the supplemental CD that came with the book new. Being my professor required the CD, I had to go to the campus bookstore and buy the entire book new. Also, if you are going to resell your textbook online, do it as soon as you can as the editions have a "shelf-life" being professors typically require the latest editions.