Old Navy: 30% off Everything Today Only (8/19)! August 19, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. Old Navy is offering up 30% off everything today only (8/19) when you use coupon code ONFALL at checkout! To make this sale even sweeter, there’s a 40% off kids clothes sale that ends today as well! Shipping is a flat $7, so order a few items to make shipping worth it! Thanks, SwagGrabber!