Have you tried Kellogg's Family Rewards - it's a great source for high-value Kellogg's product coupons!
And it's easy. When you purchase Kellogg's products (hopefully on sale with coupons), look for the Kellogg's Family Rewards logo on the package. When you open the product, there is a 16-digit alphanumeric code inside the packaging. Go to the Family Rewards website and input the code.
You'll receive points for each code, which can then be cashed in for high-value coupons!
Click here to get your high-value coupons!
(This post may contain affiliate links. Please see my disclosure policy for more information.)