Take me from me bro, I almost got ripped off 600 dollars. "almost" meaning it took me 6 weeks to get it back. But I did with persistant.

Talk with people and look for that fucker. Get someone to set up another deal (basically thinking he could do the same to that fucker) and when he meets up, just confront his ass, along with one of your boys or two. You don't even have to use violence, because at this point, he'd be so freaked out he'd be shitting his pants. It's a nice trap, especially if you want your money back.