Kwik Trip(Photo: Maureen Wallenfang/Post-Crescent Media)Kwik Trip will purchase two Express Convenience Centers in Appleton on Dec. 18, changing both into Kwik Trip branches. The locations are on Richmond Street at the corner of Franklin Street, and on Wisconsin Avenue at the corner of Meade Street.Kwik Trip also signed a purchase agreement for the vacant northeast corner of Casaloma and Greenville drives in Grand...