Where can I find Baking soda in Härkingen?

Baking soda can also be found in these cities:

Aarau Aesch Balsthal Biberist Bubendorf Derendingen Egerkingen Egolzwil Erlinsbach Gelterkinden Gerlafingen Herzogenbuchsee Langenthal Lostorf Murgenthal Oensingen Oftringen Olten Reiden Rothrist Schöftland Schönenwerd Sissach Suhr Unterentfelden Utzenstorf Zell Zofingen Zuchwil

You can also find this in Härkingen:

Edible Curd Grated Lemon Peel Flaxseed Bread Fruit Bar Pickled Vegetables Fresh Salt Schupfnudeln Whole Grain Rolls Mayonnaise