Where can I find Cornstarch in Heiligenroth?

Cornstarch can also be found in these cities:

Altendiez Beselich Dierdorf Diez Dortmund Döttesfeld Hadamar Hundsdorf Höhn Koblenz Lahnstein Limburg an der Lahn Montabaur Mudershausen Nassau Röthenbach Urbach Wallmerod (Westerwald) Winden (Rhein-Lahn-Kreis) Wirges

You can also find this in Heiligenroth:

Milk Baking Ingredients Beer Jam Vinegar Beef Spices Cocoa Normal Rolls Acid Preserves