anywhere I can buy a variable speed fan controller?

[$pade]

something similar to this one: http://www.ocmod.com/code/show_art.php?id=4&pg=1

 

[Scootin159]

Build one - just use a power cable & a 100ohm rehostat

 

[trekin]

Also called a rheostat. And you can get it at Radio Shack for a couple or so bucks.

 

[Scootin159]

yeah, those work too