8. Special K Protein By Kacey Culliney 05-Aug-2015 - Last updated on 06-Aug-2015 at 16:53 GMT Facebook Twitter Linkedin Email to a friend Kellogg’s Special K Protein bars totted up sales of $151,426,480 for the period. Unit sales, however, were down 7.19% on the previous year. Crunch-down: America’s top 10 best-selling snack bars 10. KIND Plus 9. Nature Valley Protein 8. Special K Protein 7. Nutri Grain 6. Quaker Chewy 5. Rice Krispies Treats 4. Nature Valley Sweet and Salty 3. Fiber One 2. CLIF 1. Nature Valley Granola Prev 1 2 3 4 5 6 … 11 Next