San Francisco-based startup Leap Motion has finally announced availability of its small motion control sensor. The company revealed on Wednesday that it will ship its $80 motion tracking device to customers who placed preorders during the week of May 13th, and it will arrive at Best Buy (BBY) stores in the U.S. on May 19th. The Leap controller was supposed to debut ahead of the holidays last year. BGR had a chance to test Leap’s motion control sensor last July and we were impressed. We called the technology “a total game-changer” and said it was “one of the coolest pieces of technology we’ve seen in a while.” The Leap Motion sensor is compatible with desktops and laptops running Windows 7, Windows 8, OS X 10.7 and OS X 10.8.