They do in NZ! Wine and beer in the regular aisles (same here in Cambodia but spirits as well)It depends by what you mean 'in supermarkets'.
Like its not on the shelves, its in a seperate part of the store with a seperate register.
Does Melbs have grog on the actual shelves in woolies?
NSW requires a separate shop/area with a liquor licence or whatever. Ridiculous really.