Deal Ends 01/12. If you are an Old Navy cardholder, you can score a $15 off $50 or more Coupon from Old Navy. Just go to Old Navy’s Facebook page, “like” it and click on the $15 off $50 post on their wall. Click get offer and you’ll get an email with the coupon. You can either print the coupon or show the coupon from your mobile to the cashier. This coupon is valid in-Stores only. Hurry and print yours now! If you’re not an Old Navy cardholder, you can still get a $10 off $50 coupon, just click the $10 off $50 post on their wall and follow the same instructions above.