Here's a competition that I received details of today. Unfortunately it is only open to UK residents, so if you are overseas- sorry.
Entry is free but you must be 18 years old or over to enter. There are cash prizes: 1st £500; 2nd £300; two 3rd places £100 each. Closing date 28th October 2011, so you have plenty of time to write something.
Your story needs to be minimum 1500 words to a maximum 3000 words- no erotica or children's stories. Ideally it should be appropriate for bedtime...
You'll recognise the judges, or some of them, Della Galton, James Wong, Ann Burnett and Healthy Living magazine editor Tracy McLoughlin.
You can enter by e-mail, but do read the rules on format and pseudonym use...
All the information you need can be found here.
And good luck.