There are so many 7/11 stores in Melbourne, almost every corner has one.
They have very little in the way of essential items. They're not a supermarket, however, some do stock some basic items.
Milk - above average price
Bread - limited choice, white or wholemeal
Tuna snacks - one of my regular work lunches
Pasta - no complaints
Eggs - mainly caged
Quick food - pies, chips, ready made salads sometimes
Convenience always comes at a price. None the less, a good store.