There is a Crest rebate coming just in time for the holiday season. I don't have any details about it, other than the start date of 11/25/2012 and that the form should appear on Crest.com right around then. I spotted this package at Walmart today:
So hang on to your Crest product coupons from this month's P&G insert to see what deals you can match up. It's going to be a buy $50, Get $15 and it looks like maybe this product might be included.