Old Navy: 15% off $50 or 20% off $75 PurchaseFebruary 17, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. In addition to Gap’s sale, Old Navy is also running a Presidents’ Day sale! You’ll get 15% off $50 or 20% off $75 for President’s Day. Just enter code ONPDAY at checkout through 2/21/11.To sweeten these deals further, go through ShopAtHome and get 3% cash back.