I've got a number of settlements in Fallout 4 with "marketplaces" where I've built a number of stores. One of them has one of each "Emporium" - that is the highest level store.
I'd assumed "Emporiums" would sell shipments of materials but this doesn't seem to be the case.
Is it possible to buy shipments of material from settlement stores, or can you only buy them from the NPC merchants?
Are there any other ways of buying shipments in settlements?
I know that Trashcan Carla sells (useful) shipments in Sanctuary Hills and Connie Abernathy sells (less useful) shipments in Abernathy Farm. I've seen references to setting up a caravan from Bunker Hill but I haven't worked out how to do that yet.