I purchased my set for Nationals from Comp. Tires in Las Vegas. I was told they still had a large inventory of "fresh" tires. My contact is George at Road Racing Services. Give him a call and let him know your situation. He can probably get you hooked up.
303-789-5427
However, this may be the time to make the switch to Hoosiers. I think they are a superior tire for HPT.
Have you given the new car a go yet Howard?
-Chris
EP 82 - 1987 Toyota Corolla GTS
RMDiv. SEB