Gap: 20% off Your Entire PurchaseFebruary 9, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Starting today, 2/9 through 2/11/11, Gap is offering 20% off your entire purchase! Just enter code GAP20 to get the discount. Certain exclusions apply.Go through ShopAtHome first to earn 8% cash back.