I have a barely used IBM PS/2 keyboard that I’m sort of saving for a rainy day, which I think means for a possible time in the future when all keyboards will be unbearably mushy or annoying in some fashion. Jonah pulled together a nice set of links on the IBM clacky keyboards (others may say “clicky” but I think “clacky” is closer). One site has helpful information if the keyboard doesn’t work with your modern motherboard.