Old Navy deal!

 

From Fishing For Deals:

Old Navy

• Take $10 off your order with code THANKYOU when you use your Old Navy card (exp ?)
• 40% off one adult item (excluding maternity & clearance) with code ONGET40 (exp ?)
• 30% off one adult item (excluding maternity & clearance) with code ONGET40 (exp 2/18)

I haven't tried the codes myself, but the word on FFD is that you can stack either of the percent off codes with the $10 off code.