If you're just looking for something cheap, give this guy a call:
http://www.jbracingtires.net/ His stock is always changing but I wouldn't be surprised if you could get a set of tires for 40-80ea.
I've heard mixed reviews on the Hankooks but am probably going to end up getting a set myself next year since Kumho V710s got expensive all of a sudden. Make sure you get the C71 compound, the C51 will likely be too hard for autocross.