If your husband is being transferred to Garmish, then you are probably affiliated with the military. You should try looking on the community pages for that area, but I am willing to bet that they probably don't have anything Waldorf/Montessori in the area.
Munich is probably the closest place where you'll find something like that.
HOWEVER, a lot of the local German speaking kindergartens/pre-schools base their programmes on the Montessori/Waldorf concepts, so even if it isn't waldorf/Montessori brand, you might still be able to find a programme that is close to it.
Hard to do from far away though. You might also want to try to get in contact with some people already there (again, perhaps get in touch with the English speaking community already there?)