Price: $7 (circle sleds & ducktape)
Sledding can get pretty boring if you are over the age of 13 or so, but small changes can make it pretty fun. Go buy circle sleds from walmart or target and ducktape. Go find a short-medium length, yet steep hill. Sit down with your feet over the sled (keeping them out of the snow, then wrap the ducktape around your feet with the sticky side out. Try and make it down the hill standing up with your feet stuck to the sled. Depending on your situation, this is always made better with some hot chocolate and peppermint schnapps or hard hot cider drinks.
Cheap and fun things to do around Minneapolis/St.Paul