It's made intentionally hard though. Try buying The Expanse Blu Ray collection for example. Season 4 literally only comes region A locked, and is not playable on non modified Blu-ray players if you're in the EU. I was excited to buy it after getting a decent Blu-ray player so I could rewatch it with my partner who hasn't seen it, but something dumb like that does put a damper on things, so we haven't even bothered with it, despite downloading it.

IMO focus on purchasing physical content from creators or distributors who NEED to get paid.

It's one thing to foolishly throw money at these big companies for blurays of an already very successful series while they're throwing their old libraries in the trash or 'the vault' or just shoveling most of their money towards low quality reality garbage.

It's another to buy a Criterion or BFI or Vinegar Syndrome bluray of something out of print that they need to recoup the costs of restoring and scanning.

If someone buys a bluray of an MCU movie they are a chump, firstly for liking that stuff, secondly for giving Disney more money for it when those things already earn piles of cash in theaters and that alone would be enough to keep them paying salaries and producing that stuff.

Spend money on independent film-makers/releases, on restorations, on series you like on the verge of cancellation.

Sadly I think the conclusion is already written, physical media's days are numbered, the big companies are going to shut down the overwhelming majority of bluray and dvd production within 5-10 years is my feeling because why sell you for $20-$30 a copy of something when they can get your rent in the form of streaming monthly payments for the rest of your natural life?

And best of all with the rent they can push ads which further increase their revenue. That bluray is a one-time payment, ads for watching the movie on streaming are a continual revenue stream. I predict that they will either have completely killed off ad-free tiers of streaming to push most of their audience into an even bigger and more valuable ad pool to sell to advertisers OR the prices of the ad-free tiers will grow dramatically away from the ad-supported tiers. Right now it's a few bucks a month, I suspect within 10 years it will be 170-300% the cost of the ad-supported version.