Now that everyone's back in school, it's really not too early to start thinking about getting your holiday cards ready. With this deal from Mixbook , it'll be easy to check that off your list! Today only, take 50% off all cards with coupon code HCRD50 in your cart. If you just can't deal with getting your holiday cards completed in September, check out Mixbook's selection of other cards for tons of occasions: wedding, baby, party, birthday, greeting cards, and more! Offer expires at midnight tonight, 09/04/2013.