This deal has ended.
Textbookx.com was already a recommended stop if you are trying to beat the prices of the your school bookstore but they have upped the ante again with a 5% off coupon code valid through 9/11. It may not sound like much but their prices are cut-throat to begin with. Discounts aside, they have a massive inventory and also buy back books at 2x the average price of your aforementioned school store. Plus there is automatic free shipping on orders over $49 and no sales tax.