I had a rear tire cord on me, so bought a new set of tires, front and rear. I have two sets of 235/40-18 Michelin Pilot Sport PS2s available. These start at 7 mm (9/32) new. See Tire Rack for more info:
http://www.tirerack.com/tires/Spec.j...R8SPORTPS2XLN2

The first set I bought from mooty last year, and have been sitting in my
storage since. They measure 5mm (7/32) across. $200

The second set I took off my car, and, apparently, my alignment had them
wear less evenly, 6 mm (8/32) outside to 4 mm (5/32) inside. $150

I also have one rear tire (295/30-18) that will be available for the asking
after 5/8. It measures 5 mm outside, 3 (4/32) mm inside.

Pick-up in SF Bay Area preferred, or shipping at buyer's expense.

 

Pics as requested