I'm probably just going to buy some UHD movies on VUDU like I have been doing. I don't have an UHD player, (only my PS4 Pro) so I'm only limited to Blu-rays otherwise. Thanks for the help, though.
EDIT: I just downloaded the VUDU app on my iPad Pro and the only options I see for purchasing movies is 4K Blu-rays or Blu-rays... The physical versions. WTF? I guess I'll have to buy my movies through the VUDU app on my phone. Weird shit, man.