Emporium's Crafting Materials

Emporium's Crafting Materials has a couple of unique features to it. The first one is that the store does not remove items from the previous act from inventory. New items that are sold in the act before and currently are totaled together. Basically if you have x10 Health Potion from Act I that are not purchased, then in Act II you will have 20. This is definitely a great way to stockpile certain items for purchase in the final act of the game.
Also, if you miss any Crafting Materials from a previous act, they will show here in the next act. Of course their price is steep, and you will not gain the Supplier achievement by getting the materials from the Emporium.

Act I