Cengagebrain.com is a great place to rent textbooks for really cheap. I've rented a few books for my summer courses and I saved over $150 compared to my college's book store and amazon. I think everyone should know about this site because they really offer a ton of books and for dirt cheap. They offer hard copy books to rent, as well as eBooks, which is extremely convenient. There is a flat rate for shipping (I believe it's $3.99) and when your semester is up, you can return the physical copy for FREE with the same box they ship it to you in.