If you haven't yet completed your back to school shopping, and frankly, who has? Here is a printable coupon for use at p.s. from Aeropostale. $10 off $50 or $25 off $100. Print yours here. Right now they have Tees starting at $6, Polos at $10 and Jeans at $18. The coupon is good until Sep. 16, 2012.