Old Navy: Save 20% off of your OnLine Purchase This post may contain affiliate links. Please see my full disclosure policy for details. April 19, 2012 19 Apr Pin Share Tweet +1Shares 0 Right now Old Navy is offering 20% off of all online purchases. You can just use the coupon code ONSAVE20 at checkout. Don’t forget about going t through Ebates where you an also get cash back! Pin Share Tweet +1Shares 0