shadow,
I believe the cost is still somewhat minimal - $25, poss $35. You may only get a point return total of 12 1/2 % if you turn in one cert. I have never done this so I am honestly not sure. Others got 25% point return for 1 cert but this award gives 2 certs. Best bet is to either call Marriott (where unfortunately agents are totally bewildered about these things lately) or go to website and click on link for customer care email. It took about 2 weeks every time I emailed them but did get people who seemed more familiar with the correct answers to the questions than the res agents on the phone.