Amazon.com
- Barnes And Noble
- Tower Books
- eCampus
- Biblio.com
- Better World Books
- A1Books.com
- TextBookx
- Amazon.com Marketplace
- Bigger Books
- Promise Angels
- Langton Info
- Books-A-Million
- Half.com
- AbeBooks.com
- Amazon.ca (Canada)
- Amazon.co.uk (United Kingdom)
- Amazon.fr (France)
- Amazon.co.jp (Japan)
- Amazon.de (Germany)