I have two 275/40ZR18's for sale with 75+% tread left. They're Goodyear Eagle F1's, which I'm told are the same ones that come on newer Vette's. I'm not sure whether they're the GS or GS-D3's, but even the less expensive GS's sell for $275 each on TireRack.
Heads-up: They rubbed a bit on my '91 NA 2+2, so you'll probably want to get these for one of your other performance cars :). I'm looking for $350 shipped to the contiguous 48 states for both. I will consider offers, but no low ballers please.
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** Two Goodyear 275/40ZR18 tires ** - Nismortare09:27:28 11/16/06