I have many accounts on GD with different birthdays listed. Just received an email with a discount code for one of the accounts that looks like it's good for purchases, renewals and other services. Here are the terms:
*Not applicable to ICANN fees, taxes, transfers, premium domains, gift cards or Search Engine Visibility advertising budget. Cannot be used in conjunction with any other offer, sale, discount or promotion. After the initial purchase term, discounted products will renew at the then-current renewal list price. Offer expires Thursday, January 31, 2013 at midnight (Mountain Time).
Use source code BDAYJAN13