Why?
I never get these posts. You have an ATM card at some bank in the USA, yes? Then use your ATM card at the Munich airport and get Euros out.
Everyone acts panicky about getting foreign currency before you get there, but it is no big deal. We try to save some Euros between each trip, so we do not have to do it the instant we arrive (although it is generally easy to find the airport ATM), but we only ever have 40 or so Euros when we get there.
Just take your ATM card and you will be fine.
BillJ