There are a bunch of coupon codes that you can combine to get a great deal at Old Navy:

THANKYOU: $10 off with Old Navy card, no minimum purchase
ONGET30: 30% off one item
ONGET20: 20% off one item

Cardholders also get an extra 10% off every Tuesday, and if you have an account with Ebates, you can get 6% cash back currently. Shipping is a flat rate of $7.

Thanks, DealSea!