As often happens on the forum here, a thread pops up, several opine they would like to have a hard to find model that just doesn't show up often, then people start dragging them out of storage and showing them off and when someone who never shoots theirs and bought it years ago cheap sees someone else sell theirs for a goodly price, suddenly there are more threads and two or three for trade or sale. I've seen it a few times.
My experience has been like everyone else - NEVER see them locally in my area except for one owner at the local club who just refused to even consider selling and had not seen one at a gun show in over two years.
More threads on 18's on the forum here in the last month than the last entire three years and actually been a few for sale . . . that's how I got mine; that, persistence and luck.
And the above described starts people beating the bushes locally and on-line and more threads and comments pop up about their good fortune. Makes it sound like, "oh, they're out there all over the place, ya just gotta look". No, they're not, it's just a focused result of a small group of enthusiasts zeroing in on a particular model for a while. Like I said, I've seen it happen before here with other models.
All you have to do here to find someone with something buried back in the safe that is seldom seen is to start a thread about how hard they are to find and how hard you've been looking - before the day is out someone will post pictures of a new one in the box with all the goodies that they traded an RG 22 for forty years ago . . .

and Dick Burg will have two boxes for it.