Where can I find Mega burger bun in Sonceboz-Sombeval?

Mega burger bun can also be found in these cities:

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

You can also find this in Sonceboz-Sombeval:

Edible Curd Grated Lemon Peel Flaxseed Bread Fruit Bar Pickled Vegetables Fresh Salt Schupfnudeln Whole Grain Rolls Mayonnaise