When Amazon first introduced Prime I was able to get any of their products next day regardless of what warehouse they were in. I live in NY and occasionally so

When Amazon first introduced Prime I was able to get any of their products next day regardless of what warehouse they were in. I live in NY and occasionally some stuff would come next day air from say Arizona at probably a large loss for Amazon. Recently though they took the 3.99 next day option away from items that they do not have located in my warehouse (PA). Then the 2 day items do not ship directly from the other warehouses, they must have trucks going from KY to PA and then UPS takes final miles. Previously I would get 2 day items direct from other warehouses. So I think they are transitioning to a system where they maintain stock in every warehouse, and every warehouse is within 2 days UPS ground to everyone in USA. If you ship things to Amazon for Fulfilled by Amazon they want you to ship to at least 3 warehouses. Prime is a major reason I buy everything from Amazon. Often I can find goods at lower prices from other retailers online but the free second day shipping that is always on time cannot be beat. So this latest super saver shipping change I think is Amazon basically making shipping free due to its superior distribution system. Paying UPS for to door delivery from nearby warehouses for all these items is most likely less money than it costs stores for rent and other costs associated with brick and mortar.