Need some help? At Don Larson GM Superstore in Baraboo, our friendly and professional staff is ready to assist. Just fill out the form below and someone from Don Larson GM Superstore will get back to you shortly. You can also call us at 1-888-827-9816 to get the information you need. Don Larson GM Superstore is proud to be an automotive leader in our community, including Madison, Beaver Dam, Sun Prairie, and Middleton. Since opening our doors, Don Larson GM Superstore has maintained our solid commitment to offering the widest selection of automobiles and exceptional financing options to our customers.