Old Navy: 20% off Your PurchaseFebruary 27, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Today, 2/28 only, Old Navy is offering 20% off your purchase! Just use code EARLYBIRD at checkout. You’ll also get FREE shipping when you spend $50 or more.Don’t forget to go through ShopAtHome and get 3% cash back!