We were just in Passau and there is a Pfaff/Singer store in the old section which had just a few bolts of cotton suitable for quilting. I got a half meter of two of them. We are in Nuremberg now and when I googled I couldn't find any close enough to where we are (train station area). They may be here but I didn't see any while we were walking around and the folks I asked didn't know of any. So if there is at
least one and I missed it I will be sad. Let us know what you find and enjoy your trip. It has been extremely hot here and most places are not air conditioned. Makes for a two shower day!