Where can I find Sauce powder in Schwarzhäusern?

Sauce powder can also be found in these cities:

Balsthal Biberist Breitenbach Derendingen Egerkingen Egolzwil Erlinsbach Gerlafingen Herzogenbuchsee Huttwil Kirchberg Langendorf Langenthal Lostorf Murgenthal Oensingen Oftringen Olten Reiden Rothrist Schönenwerd Solothurn Utzenstorf Zell Zofingen Zuchwil

You can also find this in Schwarzhäusern:

Semolina Porridge Cake Vanilla Sugar Jelly Ice Cream Desserts Meat Products Lemonades Instant Coffee Pumpkin Seed Roll Canned Meat