Old Navy is offering 20% off a single item printable coupon via their Facebook Page. Coupon is valid through November 13, 2011.

Plus….

Scare up some serious savings with a sweet weekend of treats. ALL Halloween Costumes NOW $5… Just in time! In store only. Valid through 10/30/11. While supplies last. US only.

You can also earn $10 Super Cash when you spend $20 at in Old Navy stores. You can earn up to $30. This is valid for purchases made 10/21 – 11/13 and can be used 11/17 – 11/22.