(Sorry, I thought this sale was in store too..its not. online only) You can get 25% off your entire online purchase from Sept 28-30th.
Use promo code SAVE25 for online shopping. Click here to go to Gap.com.
**Note: Starting October 1-4 they will be having the Gap Friends and Family Event, where you can get 30% off regular priced items and 15% off sale priced items when you use your Gapcard and have a coupon. *