There are no kits, but there are kits to come soon. I'm not home but i had a link to one that was centrifical. You do NOT need to get one with a clutch, that's why they made bypass valves.
At the moment though, you'd have to build your own kit.
Seriously though, a centrifical is not much more than a belt driven turbo...You could probably peice together a turbo kit with a turbo legacy turbo that would have better response for low boost. But if your really serious about a supercharger, a Roots or a Twin-screw (lysholm) are much better choices IMO than a centrifical