Woot! is offering a Econo Heat 603 Ceramic Wall Panel Heater for only $59.99, 57% off the list price of $140. The next lowest price is at Amazon for $12 more, and where it received a great 4/5 stars from 90+ reviewers.

By using natural convection technology, the heat is generated in the space between wall and the header, allowing natural updraft to move the air at 2 feet per second, heating quickly and efficiently. You can save up to 50% of your heating costs this way.

Here's a video that nicely describes how the wall heater works.