As a side note, the same seller also had listed an F122 for $65 shipped this morning, and I'll give you a guess who bought that one right away. ;D
$65
shipped—way to go! That's easily half what you'd normally pay. An F for the price of an M, you can't complain about that.
Edit: Just in case anyone is interested in another M122, the seller has two of them. Here's the link for the second one...
I love these M-122s. They're undervalued because they're not directly PC-compatible. But with a $5 Teensy and a bit of patience, you've got a genuine IBM buckling-spring board that's even
more solid and stable than a standard M—and a bunch of extra keys to boot!
And of course you get to enjoy the look on your friends's faces when they see the "mad scientist" KB you're using. :?)