Cheapest? The one Starbucks within 50 miles of me is the most expensive place for coffee.
Most coffee shops around me are fancy third wave shops, making Starbucks a cheap choice. I’m sure I can find a cheaper places couple neighborhoods away but streets are not flat, traffic is always terrible and dangerous for pedestrians.
I checked out of curiosity and we have more than 200 branches within 50 miles of me.
Population density in my state: 6.35/km2
50 miles/100km is nothing in many parts of north america. I have in all honesty driven that far just to pick up groceries.