http://www.trig-avionics.com/new-tn7...at-flyer-live/

This should be available Q1 2017 - it's already popping up on aircraftSpruce & the like, at a sub- $400 price. Quite interesting for those of us with Trig transponders.

In the US, all airspace is "outside of designated ADS-B out airspace" for gliders. Or motorgliders I presume.