Old Navy: 15% off Your Online PurchaseMay 20, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Today, May 20th through May 21st, Old Navy is offering 15% off your online purchase! Just use code ONSAVE15 at checkout. Spend $50 or more before the code, and you’ll also get FREE shipping.Go through ShopAtHome first and you’ll get 4% cash back. If you’re new, you’ll also get a $5 sign up bonus when you make your first purchase.Offer not valid on Old Navy Everyday Steals, Jeans, and Swim merchandise.