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I register a ton of domain names each year. Currently I own over 100 domain names. I know, crazy huh?
Here is a little coupon code I use that works every time.
When registering, simply put: "cjcdtaker4" (without quotes) and you'll get a dollar off. You think oh, wow, a dollar! Considering that's a 8 dollar item, that's over 10% off. Not bad.
Now, when you're registering multiple domains, you'll want to use this code: "cjcdtaker4" which will give you 10% off! 
And last, if you're going to go nuts and buy a bunch of domains totaling $100 bucks or more, use "cjcdtaker7" to get $20 bucks off! That's a 20% savings! Hope that helps someone.
EDIT: Cool site someone posted as a comment: http://godaddypromocode.blogspot.com
hi;
thanks for the codes,here you can find more nice codes
http://godaddypromocode.blogspot.com
do not forget to check live section:)
thanks
Nice tips and codes there Jony, I will use them in the future