Old Navy: 25% off Today Only!August 25, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Today only, you can get 25% off everything at OldNavy.com! Just use coupon code ONSAVE25 at checkout. Shipping is a flat rate of $7, so order a few items to make shipping worth it!And don’t forget to go through ShopAtHome! You’ll get 5% cash back on your Old Navy purchases.Valid today, 8/25 only!