you are looking for a cheap model M?
Try asking Fohat or Wcass. I think they both have model m terminals. There's also another guy but I can't remember his name. Stick a teensy inside, and you've got a plug and play, programmable model M. Heh, I am typing on one M122 right now, with like 30 keys programmed with my macros.
M Terminals are absolutely great. The cheapest, most bang for buck keyboards there are.