I use the Kendrick MicroFirelite Controller and two 3" heater straps (Camera lens and Guidescope) - works well. Approx $150AU for entire setup.
http://www.kendrickastro.com/astro/index.html
Gave up using the hairdryer after I read it tends to blast hot dust onto your multicoated lens surface!!!
Doug
ps...and the irony of me using a hairdryer isn't lost on me either!!!!!