I just purchased 4 wheels and new tires. For tires I went with Cooper (as they are made in USA) and found this site to be the least cost.
As an example, for Coooper SRM II tires, local shops want about $200 each (+/- $20). I got them delivered to my door for $130 each...
Discount Tires They arrinved in a few days and I mounted them and took them to have balanced.