Where can I find Baking soda in Greppen?

Baking soda can also be found in these cities:

Altdorf Baar Buchrain Buochs Cham Ebikon Emmen Goldau Hitzkirch Horw Ibach SZ Ingenbohl Kriens Küssnacht Lucerne Malters Rain Rotkreuz ZG Sarnen Sempach Stans Steinhausen Unterägeri Urswil Wädenswil Zug

You can also find this in Greppen:

Soy Products Cognac Chewing Gum Toast Spreadable Sausage Cream Products Gelatine Crispbread Cornflakes Antipasti