I have a set of Tomahawk tire warmers for sale. They were used one time and peformed flawlessly. They are designed to work with tires up to a 180 series rear tire, and I needed a different set as my track bike uses a 190 series rear tire.

These tire warmers retail for $275.00 shipped as per their website:
http://www.cycletires.com/tirewarmer.htm

I will sell them for $225.00 shipped to anywhere in the continental United States. PM me if you are interested.