Today only, Old Navy takes 20% off sitewide with no minimum purchase required via coupon code "ONSCHOOL" as part of its Back to School Sale. Although it took 25% off yesterday, it's still one of the better general percent-off discounts we've seen from Old Navy this year. Shipping adds $7, or spend $50 or more to qualify for free shipping. Sales tax is added where applicable. Kids jeans and Everyday Steals are excluded.