Woohoo! Small press publisher Cemetery Dance has gotten into the e-book business. They are now selling e-book editions of a large number of their titles -- 27 in all so far. These range from novellas by popular authors such as Peter Straub, William Peter Blatty, and Briane Keene to ginormous books about Stephen King.
If you're interested in horror anthologies, the seminal anthology Dark Forces: The 25th Anniversary Edition is now a Nook Book thanks to Cemetery Dance. Also, check out Lilja's Library: The World of Stephen King-- I have the hardback, and that sucker is huge, filled with essays, reviews, etc. (The description says it's about 500 kb, but that's deceptive because it's almost all text. Half a meg in words -- phew!) And Stephen King: Uncollected, Unpublished looks great, too. Sure, these titles are $9.99, but the hardbacks often start at $40. If you want to read it but aren't really a collector or investor, the Nook Book can come to your rescue.
Here is the link to all their Nook Books: