Reader hackerzsuk1 has been kind enough to donate a code for those who haven't signed up for the Southwest deal. It's one-time use, so please post in the comments if you use it.
If this one is dead, though, and you haven't signed up for Southwest Rapid Rewards, you can get 60 MCR points for doing so.
The code is HXTVHT5TK0BM76.
Thanks again to hacker!