Jim,
Some track tire support companies will bring your tires to the track, you pay for them and if at the end of the weekend you return them unused they will either give you credit or your money back.
This place provides a similar sevice.
http://www.sascosports.com/products/products.htm
Find out which tire support company will be there, maybe they can help?
I have a set 4 new full depth (not shaved), just heat cycled Toyo RA-1 tires you are welcome to take.
275/40/17 and 235/40/17.
Hey no show at the DE? Too busy this month with CS, Laguna and your cross country race to bring it out in your own backyard?