I was at Kroger's today and got a Catalina stating:

Save $4 (via checkout coupon) When You Buy Any 4

Participating General Mills products in a single shopping visit between 7/2/10 and 7/31/10

*Participating Products: Nature Valley Granola Bars (all varieties), Fiber One Chewy Granola Bars (all varieties).

Just wanted to share in case this helps anyone out!