http://www.booksonline.com
2. Audio Book Club
http://www.audiobookclub.com
3. The Literary Guild
http://www.literaryguild.com
4. QPB
http://www.qpb.com
5. Grolier
http://www.grolier.com
6. Doubleday Book Club
http://www.doubledaybookclub.com
7. Science Fiction Book Club
http://www.sfbc.com
8. Book of the Month Club
http://www.bomc.com
9. Crossings
http://www.crossings.com
10. The Mystery Guild
http://www.mysteryguild.com