Hi Sigee
From the £ sign you used first I assume you are based in the UK? If so pop over to www.bck.co.uk as they do some basic PC controller keyboards complete with basic sequence software (Most also connect direct to the game port which also provides power to the keyboard, Midi Output is also provided) which will get you going, although they are slightly more then your budget, these prices are about as low as you can get for new keyboards. (Please remember these are just controller keyboards and contain no sounds or styles etc, all this is done by the computer)
Hope this helps.

Bill