There is a coupon code for Old Navy where you can get 20% OFF your entire order. This excludes everyday steals and denim. It is good through 1/31/2011.
Enter coupon code ONGET20 to see the discount at checkout. All orders over $50 are FREE shipping always too.
I got seven short and long sleeve t shirts for my son that added up to just over 50 to get the free shipping and came to 58 something with tax. After the coupon code I was charged 46 and change for seven shirts!!!