Where can I find Power bar in Knutwil?

Power bar can also be found in these cities:

Egolzwil Emmen Fahrwangen Gränichen Hitzkirch Huttwil Kriens Lucerne Malters Menziken Murgenthal Oberkirch Oftringen Olten Rain Reiden Reinach Rothrist Ruswil Schöftland Schönenwerd Sempach Seon Suhr Sursee Unterentfelden Urswil Wohlen Wolhusen Zell Zofingen

You can also find this in Knutwil:

Pudding Decorative Sugar Three-Grain Bread Cereals Delicatessen Sausage Spice Pastes Mashed Potatoes Raisin Roll Canned Sausage