It’s not on steam, not on Origin, not on GoG, and for the physical copies (on Amazon and various sites), well…let’s say that I’m not keen on paying 45+ euros for a used copy of a decade-old game, nor paying 150+ for a brand new copy, thank you very much. Plus, since it never became available as a download service, there’s now no way to buy the game without going through a disc. As it stands, that probably means that there are no new copies of the game being printed, so the game gets more expensive as it becomes rarer.