At Don Larson GM Superstore, we strive to make our customers happy. Below, you can see our hours of operation, and also get step-by-step driving directions from your doorstep to ours. While you are at Don Larson GM Superstore, you can see our extensive inventory of new and used Cadillac, Chevrolet, GMC, and Buick automobiles. We work hard to get you into the vehicle you have always wanted. That new Cadillac, Chevrolet, GMC, or Buick is waiting for you, and we deal with a wide variety of lending sources to make sure you will get the most complete and comprehensive car loan and auto financing package available in the Baraboo, Madison, Beaver Dam, Sun Prairie, and Middleton areas.