You can also just buy and rip, I know it's not popular to say this on the internet. But I like giving money to people who make things that I enjoy. I'd rather the money go to them than Starbucks or whatever
Fwiw, bluray degradation with time isn't an actual known issue. Old cds have issues that leave then very vulnerable to scratches, and the reflective backing oxidizes leading to disk rot, but both things were effectively solved by the time bluray came around.
Maybe if you're concerned about the 200yr lifespan, store them in an argon environment, but you're probably not