I've seen a few prototypes but I don't know of anything like that on the market.
Tesla Motors, manufacturer of an all electric sports car. Has a range of 250 miles, a top speed of 125 mph, and 0-60 in 4 seconds. It's for sale now, although it's admittedly expensive. As I mentioned earlier, it's high price doesn't make it economical, but the fact that it's practically functional proves that the idea is sound. It's just a matter of gaining the ability to produce the components for cheaper.