You can get 'em new from Panoz for like $50K. Or, you can buy one used for a whole hell of a lot less, like $30K or so I think. I was driving a friends, cause I have 6 friends who all have them. Its a cool option for a racecar. The body panels are molded ABS, the front clip comes right off, etc. etc.
To give you an idea how they run, the fast Panoz guys are in the 1:59 range at T-Hill. If you were to put a stroker in one it would be wicked fast, they're just down a little HP on the straights.