(I've removed all the out-of-print book vendors from this listing. Bibliofind is dead, Amazon has closed down its OOP department and neither ABE's vendors nor Alibris' bother responding to enquiries about the books they have listed.

 Publius Homepage - Get Published
 EServer.org - Accessible On-line Publishing
 Tons 'o On-line Books
 Lightning Source - On-Demand Book Printing
 Mesorah Publications - Jewish Books
 Glenn Larson - Book Technology