Yea I don't think you could get a Corvette that cheap in PHX anywhere.
Right now full size cars are higher than that...Heck I think compacts are higher than that. Of course rates change daily...but Corvettes are in the Premium Specialty fleets of anyone who would carry them so you won't see them that low around here.
Vegas probably has more companies carrying them hence the possible coupons or rate wars to get them on the road. But that's only a guess.
Ours are on the road pretty steady.