Where can I find Mega burger bun in Bannwil?

Mega burger bun can also be found in these cities:

Balsthal Biberist Breitenbach Burgdorf Derendingen Egerkingen Egolzwil Gerlafingen Herzogenbuchsee Huttwil Kirchberg Langendorf Langenthal Lostorf Murgenthal Oensingen Oftringen Olten Reiden Rothrist Solothurn Utzenstorf Zell Zofingen Zuchwil

You can also find this in Bannwil:

Mashed Potatoes Raisin Roll Canned Sausage Oil Smoothies Brandy Fruit Jelly Frozen Herbs Bacon And Ham Pudding