Except in the biggest of cities, Walmarts tend to be outside the downtown and poorer areas that need this service. Those areas do have walkable post offices. So

Except in the biggest of cities, Walmarts tend to be outside the downtown and poorer areas that need this service. Those areas do have walkable post offices. Some people don't understand how expensive it is to be poor. In lots of this country, the best shopping option people have is a dollar store.