Minneapolis, Saint Paul, Rochester, Duluth

Minnesota retail stores should first look for store fixture liquidations in their area, then the Minneapolis/St.Paul area.  There are also local dealers to fall back on.

Extend your scan for closing stores across state lines.  Sioux Falls SD, Des Moine IA and Milwaukee WI are all metro areas close to Minnesota.
Further out, Chicago, Kansas City and MI will have more potential liquidations, but also have some very active shelving dealers.
Try these nearby states:

Wisconsin

Indiana

Michigan