Register any new domain name for one year for only $0.99 with coupon code BUY2010 at GoDaddy. Normally these are $10.49, so this is a great deal. This code will expire after a certain amount of uses.
I’m pretty sure this is for new customers only. Also, domain name registration is an annual thing, so if you purchase a name, you will need to renew it every year at the regular price, although they do offer codes all the time.