Tue only: 15% off Stacksocial with coupon

The summer heat is melting retailer brains, judging by the coupon names that is, coupon SUMMERSANTA gets you 15% off today (Tuesday 7/19/16) at Stacksocial. They have online classes and some imaging software and some electronics of potential interest. As usual, some items may be excluded from the discount (manufacturer restrictions, laws, etc).