All,
I've got a set of 275/40/17 RA1s on Corvette Sawblades. Tires were ran as full tread and are currently 4-6/32nds.
They were my rains, until it didn't rain. Still a great amount of rubber left for track day or autocross tires.
Here's a link to the CL ad with pictures: http://chicago.craigslist.org/sox/wto/5821341357.html
For a FRRAX'er, cash and carry price is $300. Not excited about shipping, but I probably could if you wanted to pay the freight.