Seems developers can candidate for a free Leap+SDK if they like your project idea and think you can deliver.

>How can I get a free developer kit?

>We’re distributing thousands of kits to qualified developers, [...] register to get the SDK and a free Leap device first, and then wow us.

Apply here: https://live.leapmotion.com/developers.html

I like the small size and reasonable price. Might be cool as a 3rd input device, or for specialized terminals.