Theodore Sturgeon, the Hugo and Nebula Award-winning science fiction writer, is his short horror novel Some of Your Blood. Like Dracula, it's told in epistolary form, but it's more like Twelve O'Clock High in subject matter. The story is gritty and unsupernatural, and well worth checking out.
Neil Gaiman's short story "Snow, Glass, Aples" is a dark retelling of Snow White in which the stepmother is not the villain(ess). It's unlike much of his work and makes you long for more twisted fairy tales from his unique perspective. If you want to buy it stand-alone, it can be yours for a little under two thousand dollars (on Amazon here). It was collected in the anthology Love in Vein II, which is available for around $68. (Look for it at your local independent book store.)