Sirens Call Publications has three anthologies open for submissions. Each one needs stories of 4000 to 10,000 words, payment is split royalties. There are different reading periods for each call. The anthologies are : Fear: Of the Dark, Fear: Of the Water, and Mental Ward: Echoes of the Past. You can find all the details here
There's also a non-paying ezine called "The Sirens Call" at the site and free downloads are available.