NewEgg through eBay has the Leap Motion Controller for Windows and Mac, model no. LM-010, for $79.99 (84.99 – 5 instant savings) with Free Shipping (Best Buy through eBay has it for the same price) for a limited time.

The Leap Motion Controller makes all the space between you and your computer three-dimensional and interactive. You can do almost anything without touching anything: just move your hands and fingers in the air, the way you move them naturally. It tracks the movement of your hands at a rate of 200 frames per second and up to 1/100th of a millimeter. It’s up to 200 times more sensitive than existing motion-control technology. With zero latency, it keeps up with your every move.