We just dropped a big new study that proves that almost 9 out of 10 classic games are out of print, and it's not gonna get better.

Libraries/archives need more exemptions to close the game preservation gap! https://gamehistory.org/87percent/

87% Missing: the Disappearance of Classic Video Games | Video Game History Foundation

New study reveals most classic video games are completely unavailable

Video Game History Foundation
@shadsy Looks like the methodology behind that is just "is the game available in some form?" It's therefore probably worse if you want original versions for historic interest: for example, Valve will still happily sell you Half-Life on Steam, but it's heavily patched since the release boxed copy.
@LionsPhil Yes, we purposely did this as a best-case reading. If there's a reason to want a specific edition, it's definitely worse