haha, you're wrong.
Coupon code mean discount or bonus for limited people only.
Godaddy won't publish their coupon code on their site unless it's a big promotion.
Try to browse godaddy site and you'll see there's no coupon code you can find.
Yes I know that but these codes are ultimately provided by godaddy itself, not from someone else. Godaddy may give these codes to their affiliates or someone, who then sells it for free or money.