Where can I find Defense strengthening in Heist?

Defense strengthening can also be found in these cities:

Elmshorn Guderhandviertel Halstenbek Hamburg Horneburg Horst Moorrege Neuendorf bei Elmshorn Oersdorf bei Neumünster Pinneberg Quickborn Schenefeld Schülp b. Rendsburg Stade Wedel

You can also find this in Heist:

Three-Grain Bread Delicatessen Fruit Jelly Hair Dryer Hair Mousse Body Care Lip Care Binding Cosmetics Medicinal Plant Oil