Once in awhile, Uncle Sam lets us indulge in our shopping habit with a little less guilt. From February 19 through 21, shop tax-free at the 900 North Michigan Avenue Shops. Celebrate President's Day properly and toss some cash into the stream of commerce. This opportunity only comes around once a year, and we're not about to let it pass us by. Just to make the deal even sweeter, shoppers can park at the 900 North Michigan Avenue Shops at a special Alexander Hamilton rate (that's just $10). Check out a list of participating retailers, and happy hunting!