I've found SEVERAL promo codes DIRECTLY on GoDaddy's website. One is domain registration for $0.99, another for domain registration for $4.99 and one is for 30% off. I enter the codes, it says it's accepted, congratulates me and the TOTAL DOESN'T CHANGE! WTF Godaddy?
The $0.99 offer for a domain only works once on one domain for the entire lifetime of the account. If you've ever used it before, that's why that one didn't work. Some of those offers may also no longer be valid. Easiest way to find it is to contact phone support. They usually have a list handy.
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