Where can I find Mega burger bun in Büron?

Mega burger bun can also be found in these cities:

Aarau Bremgarten Buchrain Buchs Ebikon Egolzwil Emmen Fahrwangen Gränichen Hitzkirch Huttwil Lenzburg Lostorf Lucerne Malters Menziken Muri Oberkirch Oftringen Olten Rain Reiden Reinach Rothrist Ruswil Schöftland Schönenwerd Sempach Seon Suhr Sursee Unterentfelden Urswil Wohlen Wolhusen Zell Zofingen

You can also find this in Büron:

Baked Goods Yeast Fresh Pumpernickel Breakfast Cereals Olives Drinks Dry Herbs Spaetzle Snacks Horseradish