For Prime members, Amazon.com has the 30 count (Six 5-bar packs) of Nature Valley Peanut Butter Dark Chocolate Protein Chewy Bars for $11.99 after applying the 20% off coupon available on the product page and basic Subscribe & Save (or as low as $10.39 after coupon and five Subscribe & Save orders).

Nature Valley Peanut Butter Dark Chocolate Protein Chewy Bars, 5 Count (Pack of 6) [amazon.com]