eCampus.com

Since 1999, eCampus has been working directly with textbook publishers and thousands of other sellers to provide the best offers for new and used textbooks, study materials, and eTextbooks for sale or rent. They strive to help students "Save up to 90% on Textbook Rentals, New & Used Textbooks and eTextbooks." eCampus offers free standard shipping on all orders over $35, a large selection of used inventory, a 25-day return policy, and flexible payment options, including PayPal and Venmo.