Decent Ultraflix plug among the big boys- UltraFlix has a library of 4K Ultra HD streaming content comprised largely of 4K nature documentaries, concert videos and movies available for free-view, purchase or in 48-hour rental windows running about $10. The service is now available on many of the leading 4K TV brands and Ultra HD-ready media adapters.

http://www.twice.com/growing-4k-uhd-libraries...pump/63898