On Amazon right now you can get Nature Valley Peanut Butter Dark Chocolate Protein Chewy Bars, 5 Count (Pack of 6) for just $13.63 when you clip the 20% off coupon! This works out to just $2.27 per box!
These will ship free with Amazon Prime or qualifies for free Super Saver Shipping with a $35 purchase.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.