Where can I find black tea in Duisburg?

black tea can also be found in these cities:

Dinslaken Düsseldorf Essen Krefeld Moers Mülheim an der Ruhr Oberhausen Ratingen Velbert

You can also find this in Duisburg:

Green Tea Fruit Tea Organic Ginger Tea East Frisia Tea Honeybush Japanese Sencha Green Tea Jasmine Tea Tea Caddies Chai