I don't think it's that simple because the problem is on the backend / logistics, not the UI for the user. There's not really a half-measure solution here. The

I don't think it's that simple because the problem is on the backend / logistics, not the UI for the user. There's not really a half-measure solution here. They either have to completely redo their supply chain management (not co-mingle) or it won't work. What pool of goods do they pull from to fulfill your order? Where do they store these goods? Well, that separate pool of goods now has to be maintained. How man separate piles from how many "trusted" suppliers do they create? The probably should start doing something like this, but I don't think it's simple.