I'm sure that there are other manufacturers, but I think Mattracks has been around for a while. I have no idea how they keep the tracks from spinning around, but they've apparently worked it all out.
http://www.mattracks.com/html/88_series_model.htm
If you notice they don't list prices anywhere. I guess it's the old saying: If you have to ask you can't afford it." I've heard estimates that go from $10k to $14k a set.