Where can I find Three-grain bread in Sieggraben?

Three-grain bread can also be found in these cities:

Bad Erlach Bad Fischau Bromberg Deutschkreutz Forchtenstein Grimmenstein Horitschon Kirchschlag in der Buckligen Welt Krumbach Lanzenkirchen Neudörfl Oberpullendorf Sankt Margarethen im Burgenland Scheiblingkirchen Stuttgart Trausdorf an der Wulka Wiener Neustadt Wiesen Wulkaprodersdorf

You can also find this in Sieggraben:

Instant Iced Coffee Poppy Seed Roll Canned Fruit Olive Oil Champagne Aperitif Confectionery Potato Specialties Salami And Permanent Sausage Beet