There is always fresh bread, milk, sausages, vegetables, fruits, fish, beer on tap, sometimes coffee, kvass.
There are also some shortcomings, mistakes of the sellers themselves: I did not coal, I did not finish and they sell bullshit, sorry for the rudeness.
Well, this way you can always negotiate and change. Another disadvantage is that there are no cash registers in this grocery store and this is alarming , and you are thinking of buying here or walking 50 meters and buying in another store.