If you do shell out for a kit i'd love to hear about it. Say you do decide to ferment one, can you document the details of the kit and let us know how it turns out?!
I'm curious on how they make eiswine kits. I wouldn't think they would follow the traditional grape on the vine procedure for kits. More economical ventures like condensing and freezing then skimming ice would seem sensible. Of course I could be absolutely wrong (as usual).