Thanks guys! I spoke with the guy today and he wants $600 for all four. Definitely more than I want to pay. He's willing to meet me at my mechanic and let him inspect them and spin them on his balancer, so that piece is covered off.
He's used the wheels in summer and winter so if I had to guess they have probably taken more of a beating then if they were dedicated summer rims.
I'll make him an offer in the $300 range. Thanks again.