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UltraFlix
One of the more compelling yet perhaps least known options is UltraFlix, a dedicated 4K pay-per-use service that's available on compatible Samsung, Vizio, and Sony TVs, as well as the Nanotech Nuvola NP-1 player (Nanotech owns the UltraFlix service). Titles are available for rent for reasonable prices (often $9.99 or less); once again, there's not much in the way of big-ticket theatrical film releases (although UltraFlix was the only 4K service at the time of this writing to offer Interstellar in 4K), but there are some interesting 4K concert videos, as well as lots of free documentaries and shorts.

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