A lot of nice guns here. The OP should buy the gun or commence kicking himself where the sun don't shine. You can go years between such finds. No predicting when, only that when you do it will cost more (and you won't have the money). We all have stories, some great about the guns we've nearly stolen.
Me,my favorite story about K22s was maybe 15 years ago. I was trundling along the many aisles when I came upon an old K22. It was pretty darn good but the best part was the serial. It was K166. I know how to be quick on the draw when needed. The seller wanted $300 and I negotiated (cheated) him down some trivial amount. I walked on, a big smile on my face. Then the same aisle but the other side a guy had one. He used to be a SWCA member and a poster here. He had K155 for less money.
Not being particularly smart or a good negotiator, I just paid his price. Sure, maybe I could have gotten it cheaper. I didn't care at all. I went home with 2 great K22s. Want more bad news? The K155 gun is my shooter. Some day soon I'll croak and Y'all can get your shot at them through David Carroll. If he wants them.... Yes, they both have boxes and the one (I can't remember which) even has some after market grips. The sales receipt is from some stupid store up in the frozen Narth lands. The same store the gun letters to. A nice touch.
But if you're a pervert like me, you don't pay attention to accumulating too many K22s. Then one day you decide to sell them off. I had 3 dozen for a while. I dumped off 2 dozen to happy buyers. Smarter than me, probably. They didn't own that many. But mine are better! I'm not slow enough to sell my gems, those will make my widow comfortable. You don't get 12 good ones without looking at a lot more of them.