i think you can get a real basic one on your better MP3 players. what you need to do is find out the names of the equipemnt and shit, and i bet you can find a software that will mimic it on a computer on kazaa.
you can get a start, and a far better one than youll get here, over at TranceAddicts message boards. they have a DJ section i think. you can find alot of boards like that on google as well. the larger ones are better.
if you ever get anything together, shoot me over a demo. i love this shit.