This is a pretty good coupon to have, since it doesn't list any minimum purchase!
You can head over to the Aerie Facebook page and "like" them to print up the $10 off Aerie Coupon.
You will probably be able to score some free stuff!
Find an Aerie store near you: http://on.ae.com/iXkffW
Take $10 off Your Aerie Purchase In-stores This coupon is valid for one-time use from April 28, 2011 through May 1, 2011 only in Aerie stores. Not valid at aerie.com. You must present this original coupon (no copies) to receive discount. Discount applied to Aerie merchandise only prior to sales tax and shipping & handling. Only one coupon or discount of any type may be used at one time. This coupon is not redeemable for cash, nor is it valid toward any previously purchased merchandise or the purchase of gift cards. Offer’s value will not be refunded on merchandise return.