I remember prices similar to that. Especially .22 LR. I was a salesman for the Oklahoma Tire & Supply Company (OTASCO) in the 70's and 80's. You did it all in those stores. In the course of a day you had to sell washers and dryers, refrigerators, lawnmowers, garden tillers, chainsaws, TV's, stereos, air conditioners. You name it and you better know everything about everything you were selling. If you sold a set of tires you might very well be mounting and balancing them. Of course selling guns, ammo and accessories was my favorite. Sold a ton of those boxes of .22 LR for .79 cents a box. We stocked those Savage, Springfield, Stevens and Fox shotguns like this one.It was in the 'early 70s in Denison, TX. The guy at the gun counter knew us pretty well and would also sell me .22LR (Ha! 77 cents for a box of Federal), but he said to keep it quiet.
I don't remember the Mexican ammo brand, but it was in yellow & black boxes, and had an image of a Thunderbird on the box. The shells were high-brass, yellow plastic and (I think?) mostly #4 shot. I don't recall any misfires.