I would say eBay and Craigslist would be friendly to you for your price range. I am big on legacy boards so for piano I really like my Ensoniq KS32. 76 weighted keys and amazing sounds. And I found it for $200. Of course it was a friend who had it, but it was about the right price. I would have paid her $250 for it but she game me the "You're a good guy and I like you" price...