Mark Sisson is running a 30 days of competitions over on Mark's Daily Apple, with "Over $6,000 in Prizes". It's being billed as The Primal Blueprint Health Challenge.
I was unable to resist entering a few of them myself, and am including the video and photos I entered below.
Competitions vary from the small (send a photo of your breakfast) to the large (create your own Primal Blueprint workout video.) The prizes aren't too shabby either, with that second example promising the winning entry quite a haul.
There is a list of the competitions, many of which are still open, here. There are more being run every day. Here are my own entries so far:
Show Your Breakfast Competition.
Primal Post-Its Competition
Primal Blueprint Recipe Video Competition