Science Fiction, Fantasy, Horror

Barry R. Levin Science Fiction & Fantasy Literature: From the Golden Age of science fiction and fantasy to today's hottest authors, a showcase of rare books, fine art, and original manuscripts that will enhance the library of every serious collector.
Books from the Crypt - Books, Pulps and Ephemera: Dealers in used, rare and collectible books, pulps and ephemera - Specializing in science fiction, fantasy and horror from the age of the pulps, 1923-1956.
Clarkesworld Books: New, used, and collectible science fiction, fantasy, and horror books.
Cobblestone Books Online: Cobblestone Books Online specializing in science fiction, fantasy, horror, mystery, pulps, collectible paperbacks and much more.
Dangerous Visions: Specializing in new, used, and rare science fiction, fantasy, and horror in all its printed forms since 1981. Frequent autograph parties. On-line ordering. Free Search Service
De Warehouse: Specializing in German science fiction, including Perry Rhodan, Atlan.
Fantastic Collectibles: 45,000 Science Fiction & Fantasy paperbacks, hardcover books, and pulp magazines to sell or trade. Plus thought-provoking articles, author reviews, display ads. etc.
Fantastic Literature: The UK's largest online purveyors of out of print, rare science fiction, fantasy, horror, crime thrillers and macabre fiction both in paperback and hardcover.
J. Yeager Books: New, used and rare books with emphasis on science fiction, fantasy and horror.