Originally posted by: bassoprofundo
If you're wanting a genuine IBM/Lexmark, they are out there, but only in PS/2 form, and they command a serious premium over their beige counterparts.  I happen to have two of these beauties (one for work, one for home) that I managed to pick up during a office cleanout.  They were brand new in-the-box, and I wouldn't trade 'em for the world.  I use a $5 PS/2 to USB converter on the work one, and it works great.  Clickykeyboards.com occasionally gets some of these in, and you can also occasionally snag one on E-bay.  Like I said, though, it will cost you. 
 PIC #1 of my baby
PIC #2
PIC #1 of my baby
PIC #2
(Pics not for the faint of bandwidth)