Northern tool is having a heater sale.
http://www.northerntool.com/shop/too...BSMZ63B81HSdRY

Included is a waste oil heater.
http://www.northerntool.com/shop/tools/product_586_586

Our favorite is the Mr. Buddy, Big Buddy w/ circ fan
http://www.northerntool.com/shop/too...7957_200307957

The basic but a very good item to have on hand.
http://www.northerntool.com/shop/too...5499_200395499

Last but not least. What we call the Bug Out Buddy
http://www.northerntool.com/shop/too...2083_200362083