Hekata
Artisan
I was considering getting an expansion now that they are on sale, but I see that the expansion has to be placed right away and I don't want that. With my current layout I still don't know where I want the expansion to be and I was planing on waiting to get at least 2 or 3 before deciding where they would be the post useful. So while I suspect what the answer is, I still want to check if there is a way to buy it and store it in case I'm missing something.