thredUP a site that sells gently used name-brand clothing, is currently offering new members a FREE $15 credit whenever you enter the promo code HOLIDAY15 at checkout. That means you can score completely FREE kids clothing or shoes after your new member credit – just pay $6.95 shipping! Or use the promo code HOLIDAYSHIP to get FREE shipping – no minimum! However, you cannot stack both codes, so you’ll have to use the one that works best for you.