I am not really sure, but I think about 1000 for the week including airfare.
Airfare would be the bulk of it. I stayed at a farm house about 25 miles away. I'm sure I can get rooms for like $15 per person per night...unless the rates changed. Travel to and from would be by train unless we spring for a van and fuel.
With our own transportation I could take everyone on side trips to the Neuschwanstein/Linderhof castles, Garmisch/Zugspitze, Dachau Concentration Camp, Hofbrauhaus, etc.
Just trinking out loud.