To my understanding all WRC cars are specials. They are loosely based on production models, but that is where the similarity ends.
I think that FIA rules require that at least 50 cars are build. But these are all sold to rally teams. There is little chance that a real WRC spec car will ever be driven by an individual who is not sponsored.
The alternative is the group N rally cars. These are based on the showroom models of the Impreza and EVO's, but stripped of airco, power windows, and so on...
A month ago a dealer in the south of the Netherlands had a new EVO 7 RS for sale. Prices start at about $ 60.000,-

Simp...