i believe to buy cars from copart auto auction u have to be a dealer and have a dealers and rebuilders licences..my brother owns a car lot and he sometimes buys cars from there thats in not to bad of shape.
I used to drive a truck for them a few years ago. Kevin is right you have to have a dealers or dismantlers type buisness license. I know at the one i workd out of that you could go to the parking lot on auction day which i believe is every tuesday and hook up with a buyer. They would get people in but you had to pay like a visitors memebership thing for the day. They always did have a ton of cars and most of the trucks and american cars would go dirt cheap. The lowest bid they would take would be $35 bucks a car. You could get most vehicles for under 7-8 hundred dollars.