The James White Award is an annual science fiction competition. For a short story of between 1,000 and 6,000 words, they're offering £200 plus publication. This competition is only open to non professional authors, but this is defined in an unusual* way, so check the rules before entering.
*Despite being a full time writer, I'm eligible (if you discount the fact that I don't actually write sci-fi that is).
They're taking a broad definition of what science fiction means. What does it mean to you?