There are still 15 available... Have these gone out of fashion?
As you may know, unlike regular 101-key Model M's, which can be used with modern PC's (via PS/2, or with a $2
cable-style PS/2->USB converter—the cheapest and most compatible type, IMHO). 122-key terminal M's like these, though, require a Soarer's converter for RJ45 connectors, and
they're $40 (assuming you're not prepared to convert the board internally yourself).
So for about the same dough they'd spend on one of these boards and a converter, most people would rather have 101-key M's, which take up less desk space and are easier to resell.
Besides, for $30–40, you can get a native-USB (or PS/2, if you prefer) genuine buckling-spring 122-key terminal-style Model M, in the form of one of the Unicomp-made OEM boards that turn up regularly on eBay.
So as kishy says (and kishy's a legend, BTW—hi kishy), the only people to whom it really makes sense to buy boards like these are people who are still using 20- to 30-year-old IBM terminal equipment and must replace an original M-122 that has pooped out. Each of those things (using systems that old, and M-122's pooping out) are highly unlikely, so it's even less likely they'd
both happen.
I hope that explains it.