Hi omerco,
I have purchased my ATAS from Motorrad Maier in Landshut, which is in Bavaria near Munich. This dealer ist very experienced in dealing with international customers, as many people from all over the world are coming to Munich by plane, and some employees pick up the group to bring tehm to Landshut, where they are starting tours all over the alps on rental bikes.
I have purchased and exported my ATAS from this dealer, he took care of the all the paperwork required to import it to Switzerland (which is not in the EU, therefore you have to deal with customs and such!)