Vinegar syndrome has a couple UHD releases that are on 100GB BluRay. Storage available has been.. ahem, sparse. But you can get a real nice nearly-automated workflow for ripping with makemkv.

Beware that not just any Blu-ray drive will work with UHD Blu-ray discs. There's both hardware limitations (100GB aka BDXL) and firmware restrictions (incl. copy protection) for with the drive needs support. Some drives with the hardware to support BDXL but without official UHD support can be patched to support UHD but check the MakeMKV forums before you buy such a drive.

I haven't come across any Vinegar syndrome releases yet (that I'm aware of) but lots of Shout! Factory or Arrow Video ones. From the Films that I'm interested in more have UHD releases now than not.