Extra 10% Off Sitewide has Extra 10% Off Sitewide by using promo code MASTERPASS and checkout using MasterPass as the payment method.  Here is a screenshot for your reference.  MasterPass is similar to PayPal and  You can use American Express, Discover, MasterCard, Visa, Diner’s Club and other branded cards.  It is rare to get a 10% off coupon that works on sitewide.
Originally posted earlier, this is just a friendly reminder as today (12/21) is the LAST DAY of this promotion.