These super cars are called Hybrid Rally1 cars and it is a top category of the sport at the moment. It is possible to buy them and the price is at least 500k€ per car. You must have some spare package but I don't know the price for this. Only M-Sport rents them and the price is around 200€ per rally kilometer. I guess that minimum is 100km, just like when we rent the rally cars of the lower classes.
But you can rent some low budget rally cars and have the same fun as in these animals cars.... :)