Where can I find Mega burger bun in Fernwald?

Mega burger bun can also be found in these cities:

Bad Nauheim Butzbach Giessen Langgöns Lich Lollar Mücke Münzenberg Nidda Pohlheim Reiskirchen Rockenberg Wettenberg Wetzlar

You can also find this in Fernwald:

Fish Sticks Roll Cheesecake Help Sunflower Seed Bread Power Bar Salads Iced Tea Coffee Infant Food Dips And Sauces