Old Navy has a coupon that you can use online or in-stores. The coupon lets you take 20% off your purchase, unless you have an Old Navy Card, GapCard, or BananaCard. If you have one of those cards you can take 30% off.
To save 20% off online, use promo code ONSAVE20 at checkout.
To save 30% off online, use promo code ONSTUFF30 at checkout.
This deal is available until July 18th.