[Draghmar]

AIUI you have to be specifically approved by Google to run Android TV - and I'm not sure many smaller third parties have been successful in this. Apart from Google, with their Nexus Player, It currently seems limited to TV manufacturers like Sony, and big companies like nVidia.

A few smaller companies have released boxes with Android TV - but I think those have been slightly dodgy implementations and unapproved...

And when you see things like some approval needed there's a great chance that you'll have to pay in order to get one.