1. Arkham House
Publisher of books by J.G. Ballard, Ramsey Campbell, August Derleth, Clark Ashton Smith, and most famously, H.P. Lovecraft. You can buy books online here through their catalog.
2. Black Death Books
They sell horror, dark fantasy, and pulp fiction through their blog. They do take credit cards.
Publisher of books and games, with a heavy concentration on Cthulhu and HP Lovecraft-related.
4. Creepy Little Stories
Tiny books of bedtime stories you can buy for your kids. The newest book is "Tales of the Truly Grotesque."
5. The Enchanted Art of Jessica Galbraith
Jessica Galbraith's fabulous dark and goth fairy art. She sells original art, prints, books, collectible figurines, stationery and calendars. My favorite original painting here is "Moonlight Masquerade."
6. Alan M. Clark
A sci-fi and horror fan and illustrator's art gallery. I'm a fan of his work. Long ago, he did the original logo for the Cabinet of Dr. Casey horror site - it was so awesome. You can buy his original paintings, or just prints here.
My favorite original painting for sale here is the gloomy Forgotten.
7. Morbidly Adorable Creations
Misty Benson's cute fairy art, gothic lolita art, and Day of the Dead art. She sells prints, a charming Tarot deck, original paintings, and even perfume oils.
8. Morpheus Gallery
They sell contemporary fantastic art by artists including H.R. Giger, Zdzislaw Beksinski (my personal favorite from this group), Jacek Yerka, De Es Schwertberger, Wayne D. Barlowe, and Gerard Di-Maccio.
9. Drive-Thru Horror
A store selling downloadable electronic editions of books. They sell titles from Random House, White Wolf, Monolith Graphics, and other publishers.
10. The Overlook Connection
A horror press and bookstore. They sell Peter Straub limited editions, Stephen King, magazines, and books by other horror authors.
11. New Age Dolls
Jade Perez's wonderfully creepy art dolls.
12. Naoto Hattori
Limited edition prints from this talented surrealist artist. Not everything here is "dark" but it's definitely surreal.
13. Subterranean Press
A publisher that sells books in the horror, suspense, and dark mystery genres.