Used to walk over to Gibson’s discount store and get a 50 rd box of Federal 22 LR hollow points for 25 cents a box or 5 boxes for a dollar. 25 cents was my lunch money for the day.
Gibson's Discount Store... when a small local "department store" closed, a Gibson's opened up in the building and that was where I bought most of my .22LR ammo (invariably Federal). I remember having to sign for it at some point, though there was a time when the signature wasn't required there, IIRC. The Holiday gas station was another place you could get .22LR and shotgun shells - they were open later than Gibson's - but I don't remember what brand(s) they usually carried (maybe CCI/Omark).
The two hardware stores and the farm supply sold ammo as well, but if you were looking for ammo on a Sunday or after 6 PM, you couldn't be too picky about who made it.
Small-town (but not TOO small) Iowa was a wonderful place in the 1960's.