I regularly run into shows and movies no one will carry.

A recent example is Hot l Baltimore. It's an early Norman Lear production and stared James Cromwell and Charlotte Rae.

https://en.wikipedia.org/wiki/Hot_l_Baltimore

I planned to add Turn On (1969), Tim Conway. It was canceled while the 1st episode was airing.

But since the last time I looked for it, some ethical soul uploaded it to wikipedia. https://en.wikipedia.org/wiki/Turn-On

BBC: This Was the Week That Was. TV, aired 1962-1963

NBC: This Was the Week That Was. TV, aired 1963-1965. Someone found acetate audio recordings of two episodes and ripped them to YT. An act of culture, done in spite of rights holders.

https://www.youtube.com/watch?v=PtVRJ2qdYw4

https://www.youtube.com/watch?v=pprBfg6OSRM

Not a movie, but Police Squad is missing from streaming services. It's strange given it spawned 3 movies and now we even have an upcoming sequel to those.