. Like?

 

Yes please let us know what's out there for cheaper. Links always help

 

Mark viii fan with a custom made relay harness as a controller, I have about $60 into my entire setup

You can pick these fans up on ebay for around $50-70 or pull one from a lincoln mark viii in a junk yard for less, make sure to get a 2 speed fan


http://www.ebay.com/itm/Lincoln-Mark...item3cbf18aeb0

Then buy 5 relays and harnesses off ebay
http://www.ebay.com/itm/12V-30A-RELA...item415938d6a1

And then wire them together like so...


another view of the wiring diagram

 

Convenience is worth something, too. Although, with the DIY answer staring at me, the Troyer kit doesn't seem to make as much sense.