I don't buy a ton of domains, but when I do, I get them from Gandi. I support them primarily because they use and contribute to free as in freedom software. Also, even though they are more expensive than other registrars, they are generally not jerks and tend to not treat their customers like garbage.
To celebrate their 10th birthday, they are giving away domains via promotion codes distributed to their current customers. So if you have a Gandi domain, you can sign up to receive your code(s). The number of codes you get depends on how long you've been a customer -- I've only been with them since 2004 so I get 5 codes; people who have been with them since 2003 or before get 10.
They don't actually give them out until March 1st. If I have extras to give, I'll say something about it here.