When you visit the Mrs. Fields website, for a limited time only, you'll have the option to do an email signup and receive 15% off your first purchase.
This offer should appear in a pop-up window as soon as you enter the Mrs. Fields website. If it doesn't, you can still enter your email by scrolling to the very bottom of the main page. Under the "Connect With Us" section on the right hand side, enter your email into the small white and grey bar marked "Save 15% now! Join our email club!"
An offer for 15% off will then be sent to your inbox.