Old Navy Weekly offers coupons to use for in-store purchases at Old Navy.  These are great to combine with sale and clearance prices to get great bargains.  These coupons are only good for the current week (Friday to Thursday).  Here are the coupons and directions for getting them. 

$15 off a $75 purchase- click on the "Toddler Boys" star, then click on the boys sweater on the right side of the page and drag over on top of the hoodie
$10 off a $50 purchase- click on the "Girls" star then drag the sandals from the outfit on the top right and place them on the shoes on the bottom center of the page
10% off your entire purchase- click on the "Boy" star then click on the picture of the boy