Used is your only option at this point, that sockets been dead now for like 5 years.
The processors are also terribly slow even compared to a new $50-$60 Athlon II, I wouldn't advise spending much on it. You can get a decent socket AM3 dual core, AM3 motherboard, and 4Gb of ram for under $200 easily. Possibly even for $150 if you can find some good combo deals.