Since it keeps changing on the Cosmopolitan website, you would have had to be watching it to see the dates change.
Since I was planning trips in May 2011, Jan. 2012 and now, I've been keeping an eye on this website & check it from time to time.
For example, if you look at it now, you'll see that it says it ends May 31, 2012. Watch the end of May 2012, and you will know if they extend it.
Cosmopolitan Promos
Wait, you yourself already gave this link......uh......I'm confused.