Target has different prices for shipping based on your selected store! This despite shipping from a warehouse, not the store. It would surprise me if the WalMart instore prices don't vary by location (I have not checked).

> Doctors and drugs who are in-network for insurance would be the same cost anywhere in the US

I don't believe this to be true. For example for dental here is a price scaling chart based on where you live: https://www.opm.gov/healthcare-insurance/dental-vision/plan-...