Ghostlight is the magazine of the Great Lakes Association of Horror Writers. Their current reading period ends December 31st, and next year they'll be cutting back on their issues as well as eliminating poetry, so now is a good time to submit. The magazine pays $5 per story or $4 per poem, and their listed response time is one month. (Click on the "Ghostlight guidelines" link to view the guidelines in PDF form.)
Daily Science Fiction doesn't publish horror, but they will consider dark fantasy. They pay 8¢ per word for stories anywhere from 100 to 10,000 words long, and there's a chance they could choose to reprint your story at some time in the future, in which case you'd get paid more. They typically respond in under a month.