Always surprised by how much I get for my used textbooks.
Surprisingly, I made money selling my textbook here! I had gotten a great deal on a like new textbook from a friend and sold it back to them after the semester and was plesently surprised to make some money.
This is really a last resort if you're trying to buy/sell your books. I bought two books, one for my geology class the other for my statistics class. Both of them were really poor quality. The binding for the geology book was coming undone and was missing a chapter in the back. The statistics book was decent enough but was heavily marked. The price is cheap enough, but don't expect to get anything if you're trying to sell things back.