Prior to the 1980's or so it was fairly uncommon for police agencies to issue sidearms. Most officers were required to purchase their own, either privately or through the department's purchasing agent.
When I left the Army in 1972 and joined a local police department in a mid-sized city we were required to provide our own handguns (and practically everything else). The requirements of that time were: S&W or Colt, 4" barrel, blued steel, .38 Special or .357 magnum.
Many of the older officers were "grandfathered" from days prior to these requirements. Some carried .44 Specials, quite a few carried .38-44 Outdoorsman, and some carried 3.5" Model 27's (or pre-27's).
In those days a brand new S&W M&P Model 10 .38 Special revolver was about $85 retail, or about $70 on a law enforcement purchase order. A new Model 19 was about $130 retail, or about $110 on a LE purchase. The Colt Python could be had for around $185 retail, or about $165 on a LE purchase. For comparison only in this discussion, a brand new Colt Government .45ACP was about $140, and a brand new Browning Hi Power was about the same.
Putting this into perspective, my entry-level monthly salary was $657 and after federal and state income taxes, retirement fund, and Blue Cross-Blue Shield were taken out my take-home checks were $192 every two weeks. There was no overtime pay. My house payments (new 3 bedroom 1 bath home with attached garage @ $17,700 price) were $182 PITI, no money down VA loan.
A new middle-of-the-road Chevy or Ford could be had for about $3000, but most of us drove used cars. My first new vehicle was a 1975 Ford 1/2 ton pick-up, base model with 6-cylinder and 3-speed, purchased at year end close-out for $2495 plus taxes, and financed for 3 years by my credit union for only $77 per month after my piece-of-nothing trade-in.
Hamburger was 3 pounds for a dollar. We shopped the "day old" shop of the local bakery and bought bread for 15 or 20 cents per loaf. Canned vegetables were usually 10 cans for a buck. A can of Spam was about 49 cents (just looked last week, they are now ten times that price). Two or three families would go together to purchase a side of beef or a butchered hog for 25 or 30 cents per pound.
In Colorado I could purchase a resident "sportsman" license (fishing, small game, deer, elk, antelope, bear) over the counter for $35. Now I have to put in an application for each species prior to the annual drawing in May, and MAYBE get a deer or elk license one year out of four, only about $50 or $100 if successful in the lottery (more licenses are reserved for non-residents at higher fees than are issued to tax-paying year-round residents).
This may sound like a rant, but my intention is only to clarify that the $135 Model 27 of 1972 is still out there, but it will cost you ten times as much to own today, and you will keep it in your $2000 gun safe (which none of us could afford back in the day) inside your $350,000 house.
Today's dollar just ain't the same as a buck used to be!