For those who are afflicted with Bibliophilia and the various Autodidacts on tumblr
Abe Books.com
General Books and Collectors books.
Zubal Books.com
General Books and Collectors books.
Antiquarian Bookseller’s Association of America.com
As the name states, this is a collection of folks who deal in antiquarian, collectors and general books.
Weiser Antiquarian Books.com
General Books and Collectors books.
Ajnabound Esoteric Books
High end occult books, very well done with quality bindings.
Ouroboros Press
High end occult books, very well done with quality bindings.
IXAXAAR
High end occult books, very well done with quality bindings.
And a couple of related sites:
Bibliomancer Blogspot
A wonderful blog that deals with a myriad of rare subjects.
Complete Witch Illustrated Bibliography Project
A really neat project started by Kevin I. Slaughter which goes over the bibliography (which spreads over many different disciplines and subjects) of the Satanic Witch. Don’t let the name fool you, you will learn more about human behavior here than just about anywhere.