I've never used the site, but 365 Games are selling the Ultra HD Blu-ray release of
Everest for only £4.99 with free delivery. I haven't watched it all the way through, but it looks to be a reference quality disc and is apparently a gripping film.
https://www.365games.co.uk/4k-uhd/ev...4k-uhd-blu-ray
They are also selling the Planet Earth II UHD set for £13.99.
https://www.365games.co.uk/4k-uhd/pl...4k-uhd-blu-ray