Used Mystery Book Stores

Booked for Murder - Independent bookstore specializing in new, used, rare, and collectible mystery books.
Cemetery Plots - Collectible modern mystery first editions, many signed. Also mystery reading copies for the non-collector.
Chess Valley Books - Features used crime fiction and best sellers. Order by email.
Detective Fiction - Exclusively offers crime and mystery fiction with free delivery worldwide.
Fyrbyrd Bookshop - Carries mystery and suspense, from whodunits, police procedurals, famous detectives, noir, and true crime. Also sells rare medical books.
Grave Matters - Offers new, used, and out of print mystery, detective fiction, and related reference material.
Mystery Book World - Devoted to the sale of current, vintage, and popular previously read mystery, crime, and thriller fiction and non-fiction for both collectors and devotees. Site requires Flash.
The Mystery Bookstore - Signed first editions, rare and collectible, new and used, children's. Shop instore (Los Angeles) or online.
Regarding Books - Collectible bookseller specializing in mystery and modern first editions.
River Road Books - Specializes in modern first editions in literature and mystery with some popular fiction. Stocks collectible small press books from Franklin and Heritage Press.
Rufoustowhee Books - Specializes in mysteries. Categorized listing shows available quantities in each genre.
Title Recall - Specializes in crime, detective, and mystery fiction thrillers.