Enter and Win the Birchbox Black Friday Sweepstakes. They are giving away one $500 gift card, 10 $100 gift cards, and 100 $25 gift cards to use in the Birchbox Shop. Enter your name and email address in the fields provided on their site for your chance to win! Plus, earn 10 additional entries for every product you purchase in the Birchbox Shop. You can enter this Sweepstakes until November 25, 2012. Only available to U.S. residents.