Amazon offers offers its Prime members the Clif Bar Builder's 2.4-oz. Protein Bar 12-Pack in Chocolate Mint for $8.57 with free shipping. (Non-members can spend $35 to qualify for free shipping.) That's $0.71/bar, $2 under our June mention, and the lowest total price we could find in this quantity now by $16. They contain 20 grams of complete protein.
Note: This item is part of Amazon's "Add-on program"; it can only be purchased with an order of $25 or more.