For a limited time you can get a free $10 credit to ThredUp when you join through a friend’s referral link. Join through << that link and you should get your credit right away. This credit DOES apply to shipping, so look for something priced at $3 or less and you’ll get yours for free! Additionally, use coupon code AUGUST20 to get another 20% off! I do not know when this promotion will end, so don’t wait too long!
If you aren’t familiar with ThredUp, they sell gently used clothing for kids. This is a great way to get a few cheap Back To School clothes for your children!