Same thing over here. Old used boards are extremely hard to find.
I have also heard too that you could go to a computer recycler. There are 3 here in Las Vegas, but my luck hasn't been all that great. Although a friend was lucky enough to get one from the recycler just before I started looking for my first model M. I guess you just have to be in the right place at the right time. The two I picked up yesterday were from a company that opened their doors in the late 80's and because of the economy, they were closing. Not enough business. It was a small place that appeared to do some sort of database management, but I have no idea what they did. All I saw was a couple of boxes witha keyboard sticking out of the top of one in the back of the building. Lucky too since today is garbage day and all of the equipment would have been in the landfill by this evening. I got 2 IBM PS/2 computers that are still working. Manufacture date on the computers is 1987 too, so presumably, they were still using them for something. My best friend is getting the computers, but I'm keeping the boards. For some reason, I think it's because he know s I love these boards, he didn't want them. He'll probably either get newer keyboards that work with the computers or he'll find his own model M. He is partial to the space savers. In either case, I have some cleaning to do and I'll be putting these to use too.
Don't hate me, but I proposed to trade some hard drives I have for another one a while ago. He came back with this.
"It's a 1992 gray label, 101 key Model M in good, used condition. It had the PC/XT coiled cable (probably a replacement 'cause it looks new) so I threw in a PS/2 adaptor.
No need to send the drives. I should be able to ship this tomorrow. I've got another drop-off at the PO anyway.
You're welcome and enjoy.

"
All of the sudden, I have model M's coming out of the woodwork.