Where can I find Mega burger bun in Zellberg?

Mega burger bun can also be found in these cities:

Alpbach Finkenberg Fügen Gerlos Jenbach Königsleiten Mayrhofen Pill Praa Schlitters Schwaz Tux Uderns Umlberg Zell am Ziller

You can also find this in Zellberg:

Milk Beer Jam Balsamic Vinegar Pork Potato Products Sesame Roll Mayonnaise And More Pudding Powder Soy Products