Better World Books is an ethical online book retail business taking part in various social programs and offering you to buy used books and textbooks thus saving them and also donating to those in need.

AbeBooks is an online bookstore affiliated with Amazon.com – one of the biggest bookstores currently online, to be more precise. It’s a Canadian enterprise that was founded back in 1995.

Book Depository is a well-known and very popular UK-based online bookstore that has won several major awards in Great Britain since its launching in 2004. Its headquarters are in Gloucester, UK.