@Tes yeux noirs,
Yeh, me too, for many reasons. I remember fly papers in stores, sort of vaguely.
You and I have lived in different countries. In the US, some other states can be "different countries" too. I was mostly in big cities or less big cities, and we didn't have that many oldie type butcher shops around, though also not giant grocery stores yet back then.
Oddly, right now in west Albuqueque, New Mexico, we have, fairly nearby, an excellent butcher shop... with nary a fly to be seen. Hmm, also as I kid we never had air conditioning. Even since then I've never lived with it, but eventually had air conditioning at work in a big and sometimes very hot city, Los Angeles.
Never at home until now when I have something called a swamp cooler, which is sort of an intermediate step toward air conditioning. Those don't work all that well in humid places, but N.M. is quite dry.