Free Yogurt at Publix!

I just got back from Publix and there is a new promotion with Nature Valley and Yoplait. In the dairy section, there was a display set up for Nature Valley granola bars. On the box, there is a coupon for 3 free Yoplait yogurts when you buy the granola bars. The granola bras also qualify for this promotion. To sweeten the deal, there is a $.40/1 box of Nature Valley here. I only bought one box and 3 yogurts but I will be going back soon for more! I did not see any indication of how long this deal will last.