Domain site is always a thumbs down, their support is horrible. I don't recommend you using them, I have, and had to argue with them for my refund. Long story.
The promo code has been posted a couple of times before, I think the first time was actually by a NameCheap staff member but always nice with an update to the people which have not yet got the code. Besides getting the low price does NameCheap also provide free whois protection for a year.
Oh it has, I registered a domain the night before I posted this and looked on this forum (search) to see if they have any new codes and didn't find any.
Then I found one at another small forum, so I posted this the next day.
Thanks for the reminder, anyway. They said it was going to be inactive soon when they activated it so maybe it will be inactive soon and a new one will be put in place, hopefully. Regardless, I think they are a great domain reg.