Old Navy: 30% off In-Store CouponDecember 15, 2011 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Old Navy released their most festive discount today! Save 30% on your purchase in-stores with the printable coupon. It’s valid through December 31st, and it includes sale and clearance items too!This Saturday and Sunday (12/17-12/18), Jingle Jammies will be on sale for $7. Use the 30% off coupon and pay just $4.90 per pair.