You can buy soon 3 new movies from Marvel in UltraHD 3D blu-ray format, but for the moment, just in Japan, so be careful with the zones that your blu-ray player can use, in order to play them out of Japan: https://www.sony.com/electronics/support/articles/00029369

Black Widow: https://www.amazon.co.jp/-/en/x/dp/B09C22ZV9B

Shang-Chi: https://www.amazon.co.jp/-/en/x/dp/B09JKSRSXX

Eternals: https://www.amazon.co.jp/-/en/x/dp/B09N9DCSYB