Where can I find Mega burger bun in Gross SZ?

Mega burger bun can also be found in these cities:

Baar Einsiedeln Goldau Horgen Ibach SZ Ingenbohl Lachen Männedorf Richterswil Rüti Stäfa Thalwil Unterägeri Uznach Wald Wädenswil Zug

You can also find this in Gross SZ:

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