hmm. Do they really sell lightly used tires after they are done? I may consider going and picking up some too then if they do.
'lightly' may be too strong a term. I've never bought tires from an actual dealer (yes, there are actual used race tire dealers!), but my understanding is they're priced according to condition - they may have tires anywhere from near-dead to

. There's an article in May's GRM on the subject.
FWIW, my race tires (bought used from dtcevo, thanks!) had 2-4/32nds of tread roughly. I ran them for the first time at the Wide Open Wednesday event last week - probably their last time on the track, but still expecting to get a few autocrosses out of them.