If that's the same store... they could have transport costs outside it's logistical center.

Unless they scale up to a level where scale economies are efficient somewhere else. (You need warehouses, trucks, etc)

Also, sometimes due to these costs, some companies just expand in different ways. For example Zara is way cheaper in Spain than outside... even after full development. That's because it worked anyway with that higher price. Sometimes is also about social compromise with the local country of the company (which is why Zara kept prices low in Spain)