Where can I find Cornstarch in Koppigen?

Cornstarch can also be found in these cities:

Bern Biberist Bremgarten bei Bern Burgdorf Derendingen Gerlafingen Grenchen Hasle bei Burgdorf Herzogenbuchsee Hinterkappelen Huttwil Ittigen Kirchberg Langendorf Langenthal Moutier Murgenthal Münchenbuchsee Oensingen Ostermundigen Solothurn Utzenstorf Zollikofen Zuchwil

You can also find this in Koppigen:

Everything From Milk Baking Mixtures Cream Stiffener Spreads Savory Food For Diabetics Menus With Meat Fruit Spritzers Filter Coffee Baguette Roll Salt Sticks