Textbook Underground specializes in the college experience. We are one of the largest suppliers of textbooks in the nation. In fact, Textbook Underground houses millions of textbooks that are shipped to millions of students on every campus every semester, putting us in the backpacks of college students all over America. Partner with Textbook Underground through the Affiliate Program and promote our products in the textbooks, books, education and college categories. Textbook Underground only ships to USA. Purchases from Redshelf and ebooks are not trackable or eligible for commissions. Benefits: 5% Commission Special offers and promotions 45 day cookie duration Regularly updated text links Deep link API