Where can I find Tri-grain toast in Petersberg?

Tri-grain toast can also be found in these cities:

Bad Köstritz Camburg Eisenberg Gera Hermsdorf Hohenmölsen Jena Kahla Mertendorf bei Eisenberg Molau Naumburg (Saale) Orlamünde Saaleplatte Taugwitz

You can also find this in Petersberg:

Pudding Three-Grain Bread Cereals Sausage Mashed Potatoes Raisin Roll Canned Sausage Oil Smoothies Brandy