Where can I find Cornstarch in Langquaid?

Cornstarch can also be found in these cities:

Abensberg Alteglofsheim Bad Abbach Ergoldsbach Kelheim Mainburg Mallersdorf-Pfaffenberg Neutraubling Obertraubling Pfeffenhausen Regensburg Rottenburg an der Laaber Saal an der Donau Schierling

You can also find this in Langquaid:

Fish Croissants Flour Wheat Breads Diet Products Ready Meals Energy Drinks Espresso Beans Food Flips