Matt-J2,
These older, firearms, such as used police trade ins, are getting more difficult to find, I admit and agree with you.
Truth is, while they are out there, so many folks want them, just a matter of supply and demand.
I know one THR member, asked his Gun Person, to check around and find a dozen total.
Model 10, or Model 64.
I know another member that his family had their Gun Person check around and find a K frame .357s, and this family bought 8 total.
Semi-Auto the same way.
Smith autos like 3913 and 5906, are being bought up.
This is going to sound wrong, still some folks are either on a budget, or just mature enough to not need the latest greatest touted gun, and know, a 3913 will do just as well as a Glock, Sig, HK or whatever else is new.
Folks investigate and verify, they see older guns without locks, MIM and other features on new guns...nor the problems with the older guns...
I can count off the top of my head a dozen folks easy, that got rid of Glocks, Sigs and HKs, and bought a older gun instead.
I know 4 gals that got rid of Glock 26s, and made out like bandits in selling them to folks that had to have them because so-n-so said so, or said they used one or whatever.
These gals CCW K frame .357s.
Older, ones, no locks, and made when they were made right.