Where can I find Tri-grain toast in Tavannes?

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

Biel Bienne Brugg Cernier Delémont Grenchen Ipsach Le Landeron Lyss Moutier Neuenstadt Nidau Saint-Imier Tramelan

You can also find this in Tavannes:

Cheese Particle Lemon Aroma Jam Ice Cream To Portion Poultry Still Water Coffee Pods Poppy Seed Roll Canned Fruit