Have to look around. Prices on everything keep rising. I see plain old Model 10s going for $500+ and this strikes me as nuts but apparently some people will pay it.
There are deals on Gun Broker. I bought a nice (not perfect by any means) shooter grade Model 14 for $100 about four years ago. Got a Triple Lock for $300 maybe five years back. It happens. But with an Internet site there are thousands of potential buyers who may see the listing. Lots of competition.
I think if you look around a while a K22 can be found for $450 or so. Maybe less on a good day. It seems some sellers don't understand that an 80% gun is worth less than a new one and asking prices are often ridiculous. You might have to decide how badly you want it. At this point in my life there isn't anything I am so desperate to own that I will pay too much for it. That's the one advantage to being old and already owning most of what you want.
For me part of the fun is getting a good deal. I would love to own a Model 45. Don't know why, I just have always wanted one. Sellers want $1,500+ for decent one. I could write a check, I have the money available, but I wouldn't be able to enjoy owning it. Some folks just want the gun. Period. They will pay whatever it takes to have it. Not I. Different perspectives and priorities.
I looked for a pre-model K22 for a couple years and found a decent one at a local show last year for $325. That was a pretty good deal. But I spent about three years looking. That's three years I went without being able to enjoy the gun while I tried to save a few bucks. You figure out how long you are willing to look vs. how badly you want the gun. If you really, really want it, then write the check. It's only money. You can make more.