4K
https://www.bestbuy.com/site/promo/movie-tv-show-and-music-deals?qp=currentoffers_facet%3DCurrent%20Deals~Black%20Friday%20Deals%5Eformat_facet%3DFormat~4K%20Ultra%20HD%20Blu-ray&sp=%2Bcurrentprice%20skuidsaas
Amazon is matching but some such as Fantastic Beasts: The Secrets of Dumbledore...