TSS Publishing are currently open to submissions. They're looking for short stories of between 2,000 and 4,000 words. They prefer literary fiction, but are open to other genres. Succesful authors can choose between a £20 payment, or a chapbook subscription.
They also run competitions. Unlike most of those I mention, these aren't free to enter. However they do have quite good cash prizes, so you may feel it's worth the gamble.
Do you ever enter competitions with an entry fee, or submit work to places which have a reading fee?