Carver are still going and you can still but the Carver one
http://www.carver-technology.com/
The american version was carvers technology which they sold or have agreed to sell to Persu, which is still trying get the investment together to make their version of the carver one.
http://www.flytheroad.com/
I have been longing to get one of theses vehicles but don't have the cash to splash out on an expensive toy.