If you're planning on shopping for back to school clothing, supplies etc. via the internet then you make sure you shop through ebates.com.
There a number of retailers offering double cash back on your purchases.
No coupons required. Just find the retailer on their site, click through and shop as normal. You'll earn the percentage back at the end of the corner in the form of a check.
MAKE SURE YOU ARE LOGGED INTO YOUR EBATES.COM ACCOUNT BEFORE CLICKING THROUGH OR IT WON'T COUNT.
Ebates is free and does not require any credit card information nor does it store the payment info from your purchases.