Cyrix MII-300, that's the ticket. Perhaps even harder to find, plus folks might be concerned about losing their "auxiliary heat source" once winter gets here, but it is a drop in replacement for the 233 in most cases.
BK, you got any? No, that's not your ears burning, its your fingers!
seriously, though, my son is still cracking with his (my old) Cyrix and it was a great RC5 platform. Good for everything but graphic games.