About eCampus.com With ecampus.com, students can save up to 90% when buying textbooks. Students can also rent textbooks for a period of time and simply return the books when the rental period is up. Looking to sell textbooks for a bit of spare cash? Simply fill out the quote form, print the shipping label, and ship them out! Payments for sold textbooks are made through several options, making it convenient to get rid of those unneeded books.