Snapfish Flash Sale – Custom Photo Mug ONLY $3.99This post may contain affiliate links, please see our disclosure policy for details.August 29, 2015 Leave a Comment Here is your chance to score a beautifully personalized photo mug for ONLY $3.99 (reg. $11.99). Use promo code MUG399 to score your custom 11 oz. mug for $3.99. Offer ends August 31, 2015.Design your custom mug here.