As one of its daily deals, Amazon offers the Leap Motion Controller for Windows and Mac, model no. LM-C01-AZ, for $59.99 with free 1-day shipping. That's $20 under our May mention (which included $20 credit) and the best outright price we've seen. (It's also a current low by $15.) The Leap Motion Controller uses the space between you and your computer to track the movement of your hands at a rate of 200 frames per second. It purports to follow all 10 fingers up to 1/100th of a millimeter, making it significantly more sensitive than existing motion-control technology. Deal ends today.
Orders placed today are guaranteed to arrive in time for Christmas.