Where can I find Three-grain bread in Werthenstein?

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

Buchrain Ebikon Egolzwil Emmen Hitzkirch Horw Huttwil Kriens Lucerne Malters Oberkirch Rain Ruswil Sarnen Sempach Stans Sursee Urswil Wolhusen Zell

You can also find this in Werthenstein:

Breakfast Cereals Olives Drinks Dry Herbs Spaetzle Snacks Horseradish Salad Dressings Hamburger Buns Fruit Brandies