Yeah, I was thinking I would find that information in Typewriter Revolution, not that I needed an answer to it. I suspected, if nothing else, that I'd be able to re-ink an old ribbon if needed.

I suspect the Selectric cartridges would be available in some form. Given there were 13 million of these typewriters produced, I'm guessing quite a few of them are still in service, making it reasonable for the cartridges to be produced.

Anyway, thanks for the follow up. I'll do more research (although I do have my eye on a particular typewriter, mainly due to its' aesthetics).