This one takes a couple of steps, but looks like a great freebie opportunity.
SheSpeaks is a program similar to Vocalpoint or Bzzagent, where you get items to test and rave about to friends. I've been a member of SheSpeaks for several years, and have gotten some great items/coupons. Their latest campaign is for Cerra.
So, if you're already a member of SheSpeaks, just click through them to the Cerra campaign. If not, you can go to this link, sign up for SheSpeaks, and then sign up for Cerra.
Both are free to join, no strings attached.