In my experience, grocers always do include unit prices…at least in the USA. I’ve lived in Florida, Indiana, California, and New York, and in 35 years of life, I can’t remember ever
not seeing the price per oz, per pound, per fl oz, etc. right next to the total price for food/drink and most home goods.
There may be some exceptions, but I’m struggling to think of any except things where weight/volume aren’t really relevant to the value — e.g., a sponge.
