IBM Model M Keyboard Vintage # 1391401 Clicky Key December 1988 ID # 2137366BIN $49.99 + $17.05 U.S. shipping.
Missing a cap on the numpad, but otherwise in very nice shape for a 2nd-gen Model M (or 1st-gen 1391401, depending on how you see it). Most M cables didn't have the ferrite filter, so that's a little bonus too. And it's from AZ, a good dry place (well, dryer than FL, for example).
M's in good cleanable shape seem to be going for
around $80 + shipping these days, so it seemed worth mentioning. If you don't have a Model M, you can't call yourself a keeb-head—so here's a chance to pick one up at the low end of the price spectrum.