Can you buy a hovercar

You can however most forms of hovercars are not street legal nor probable. I am assuming that by hover car you mean a Hovercraft designed to support 2-4 people and travel over roads. Most "hover" vehicles are not street legal nor do they travel at a speed suitable for street travel. You make your own hovercraft or you can purchase a hovercraft from a variety of sources. However, let me reiterate there are no street-legal drive on the highway hovercrafts out there yet.