There are definitely some things that I would miss if I couldn't buy them at American prices. The top of my list is the following:
|Baking soda available the American food section at a German store|
I haven't found inexpensive, big boxes of this in the German stores but I can buy a decently sized box at the commissary. For my extensive use of it, I do really miss being able to buy the really huge boxes for practically nothing at the warehouse stores in the US.