Old Navy: 25% off Your PurchaseOctober 19, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. Wow! Old Navy just released a new coupon code, valid for 25% off any purchase! Just use coupon code ONSTYLE25 at checkout to see the discount.**Don’t forget to go through Ebates! You’ll get 8% cash back from your Old Navy purchases.Expires 10/21/10 at 11:59pm ET.