Old Navy is have a 20% off adult styles, just use the code MAKEOVER at checkout. Also, you can score free shipping on any order over $50. This sale is online only and ends 5/13.
The Old Navy Facebook page also has an in-store only printable coupon out for 30% off but it expires tomorrow (5/12/2011). Click on the tab on the right side of the page that says Hottest Ticket.
