Rick,

Here is the only place that I know of that sells the Kyosho fan unit separatly from the Kyosho Sabre.

http://www.electricjetfactory.com/Area51/kyf86.htm

I have done some experimenting with this unit and found that some modifications based on the BVM Viofan give this power unit even more thrust. Here are some pictures.

http://www.geocities.com/cnhilgers/F86mods.html

Hope this helps you out.