Bibliophile Bookshelf
Recreation, Collecting, Books, Mailing Lists - Bibliophile Bookshelf. A fee based mailing list for sellers and collectors of rare, out-of-print, scarce books in all subject areas.
http://www.bibliophilegroup.com/
The Used Book Lover's Guidebooks
Recreation, Collecting, Books, Publications - The Used Book Lover's Guidebooks. Order hard-copy versions or utilize searchable database of 8,000 booksellers.
https://www.bookhunterpress.com/