Good Old Games. They sell lots of old PC games that you can’t find anywhere else and since many old games can’t run in modern architecture, they will usually package the games up in a way that they can run without you having to run your own emulators or virtual machines.

They also sell modern games and have their own game library software similar to Steam except unlike Steam it is DRM free.

Have you played Outer Wilds and Return of the Obra Dinn? They are 2 of the best narrative puzzle games I’ve ever played.