A quantity of Grand Am GT class Continental Tire slicks are available off a Grand Am Audi R8. Sizes as follows. Cost for a new set of four is $2000. They have less than one hour of track time on each one and a healthy DE life left in them.
Tires are actually made by Hoosier I'm told.

305-650-r18 GTR

325-710-r18 GTR

$100/ tire

PM and I'll put you in touch with the team.
Located in Connecticut

 

Just to be clear- the selling cost is $100 per tire.

The new cost is $2000 for a set of four.

 

They are really Hoosiers relabeled to say Continental for the sake of the series sponsor.

 

Correct. Hoosiers in disguise.

 

those are some big tires, might try the Corvette & Viper guys too, they run similar sizes