I've seen them before, but dont know a thing about them. The buy it now price is $830. for the blower and $1500 for the full kit. The 1.50 means nothing.
Dont forget it costs horsepower to make horsepower via superchargers. I don't know the specific specs but I do know that running a 1500 HP Monster truck will cost you about 300hp to turn that big 10-71 to 14-71 supercharger. So to put a supercharger on an engine that only has 100ish horsepower will have its drawbacks. But it sure would sound good. If geard right you could run one off of the air pump pulley on the camshaft, install it on the exhaust side and run a cross over pipe to the top of the carbs.