To enter, just comment on this post within the next 24 hours, and please use a real email so we can contact all of the winners when we randomly choose them. These codes are valid in the US or EU, so you're eligible to win as long as your characters are on one of those realms (actually, you're eligible to win anyway, but since all you get is the code, it's pretty useless if you don't have a character to use it).
In fact, here's hoping you had a happy holiday week. Hopefully the family didn't get to you too much, and hopefully you got what you wanted (or at least the gift receipts for the things you didn't). Good luck to everyone, and thanks for entering these all week.