He might have bought them brand new from a local dealer. If that's the case, then they very well could have cost him that much. But, being used, and selling for $100 each new from internet retailers, they wouldn't be worth much.Wow, what a douche then.
He said on craigslist that he paid $300 for each. *eyeroll*
http://sandiego.craigslist.org/pts/461421374.html