I saw you could drive one of their cars for 895 euro's...

Does anyone know what kind of cars they supply?

Don't expect to turn up, pay and drive. You've more chance if you book in advance.

Not sure of prices or where your cost came from.

Take a look at

http://www.rent-racecar.de/

http://www.tte-racing.de/

http://www.ringhaus.com/hotel_en/public/cars.php