Where can I find Infusion bag in Oberarth?

Infusion bag 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:

Vegetable Juices Instant Iced Coffee Cheese Roll Canned Fish Fat Sauce Powder Spirits Stews Bakery Products Red Wine