I don't know if anyone knows about this, but with the new semester coming up I thought it would be helpful.
Check out
www.bestbookbuys.com. You can enter in what textbooks you need and it will search 100s of online sites to get you the best prices. The best store seems to be
www.half.com, where I got most of my books. They have a ton of used textbooks, and I saved a TON of money. If I had bought all my books used from my school bookstore through Efollett, it would have cost me $410. With this site, I paid $250.
Word up.