There have been quite a few:
In 1975 I bought a new S&W Model 17 for $145. Right next to it was a Colt Diamondback .22 for the same price. I was in college and couldn’t afford both.
I was at an estate auction a couple of years ago. There were over 200 lots, all gun or gun related. I guess word didn’t get around to the gun guys because things were going cheap.
I bought a Marlin 39A, a 1981 Win 94 in 30/30, a 1959 Win 94 in 30/30 and an old Colt 1911.
There was a Win 94 in 7-30 Waters and several Thompson Center Contenders that I wish I had bought (they went cheap) but I figured I had spent enough money that day.
About 10 years ago I was at an estate auction and bought a Marlin Camp 9 for $200.
There was a COP (4 barrel .357) that went for $225 but I didn’t know what it was until later.
Funny thing, I went to auctions at both places several months later and prices were sky high.
I guess word got around.