Use GoDaddy promo codes
I've found several fellow webmasters that although they buy domains from GoDaddy, they have never used a domain promo code! Say what you will about GoDaddy, I personally chose them early on because of how large and well known the company was. I was previously burned by a "buy one year of hosting and get a free domain" deal several years ago when I first got into websites but I'll save that for another day. Anyway, I have most of my domains at GoDaddy and always use the following promo code before checking out:
OYH3
It drops $2 off a .com renewal or new domain purchase and I've been using it for nearly a year on every .com domain I buy. I think the final total for the domain comes out to $7.20 after ICANN fee.
I actually got into using the GoDaddy promo codes by reading this thread on NamePros 
There are also other domain renewal codes found in that thread for different TLD's and it's constantly updated too.
Have you used promo codes at GoDaddy?
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of course we did!
for live codes why dont you check here:
http://godaddypromocode.blogspot.com
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“Hash1″ and “Hash3″ are 10% off as well, and it is said to last all the way through December of 2009, but I do not remember where I heard that from.
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