Go here and scroll down. The contest goes until January 6th. Since it’s Rafflecopter, you might be able to enter once a day.
Some good stuff is on sale as well, in case you have some Christmas money burning a hole in your pocket. I liked the Sacra Pagina series, Scott Hahn’s Letter & Spirit series, and, of course, the Ratzinger/Benedict collection. For the hardcore cases, The Fathers of The Church series is also on sale.