Where can I find Filter coffee in Oberarth?

Filter coffee can also be found in these cities:

Altdorf Baar Buchrain Buochs Cham Ebikon Einsiedeln Emmen Goldau Horw Ibach SZ Ingenbohl Kriens Küssnacht Lucerne Richterswil Rotkreuz ZG Stans Steinhausen Unterägeri Urswil Wädenswil Zug

You can also find this in Oberarth:

Cheese Particle Lemon Aroma Jam Ice Cream To Portion Poultry Still Water Coffee Pods Poppy Seed Roll Canned Fruit