All the major tire distributors will be at the track. I also have a small stockpile I might be able to help you out with. I assume you would run the ZX-6? I have a set of NEW 120/180 Dunlop Qualifiers I could let go for $220. I have a front Michelin Power One for $100 if you can get a rear.
I also have a front Power One RTO anyone can have for $20. I wouldn't use it for racing, though. The edges are done, but the center is good.