There is also an email code (use AUTH 170) for 15% off any regularly priced July 11-24. You're supposed to print the email but my printer is messed up but they acceted the code number.
You can sign up online at http://www.expressfashion.com/index.jsp to get these codes, it's pretty handy. Also if you just try on a pair of the new jeans they have out, they'll give you a 20% off a regularly priced item coupon valid July 27 thru 30.