I bought mine from a guy in Boulder, CO. He goes to the insurance auctions and buys the one he thinks he can rebuild for cheap and resell. You could apply for a dealers license and bid at the private auctions. If you want the guy's name in Boulder let me know and I'll find it for you.
You really need the dealers license to make any money off um. I rebuilt a Ninja, that I got from a dealeer who buys totalled cars at auction, and sold it for about $800 profit. Not really much when you count the hours of labor but it was a fun process.