I think this is due to a fight between Amazon and Disney. I was able to walk up at BB and get a day of issue copy without any problem, and at $20. IMO, it has nothing to do with BD per se. Some retailers would like people to settle for "hi-fi" movies via streaming, but that is NOT Blu-ray Disc quality, much less the forth-coming 4k, UHD. So, if you like a quality movie experience, the only choice is BD or 4k BD.
This is a reason why Amazon gets fewer BD sales from me than before, although there is still plenty of stuff I get here, including more than a few BD titles...
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