Amazon has the 6-Pack Tiger's Milk Protein Bars (Salty Caramel Pretzel) for $7.26 - 5% off with Subscribe & Save (can cancel anytime) - 25% off coupon (check "Save an extra" box, eligible on first S&S order for this product) = $5.08 with free shipping on $25+ or with Prime. Roughly 85 cents per bar. Has 10 grams of protein.

In addition, Fudgy Mocha Latte / Peanut Butter Chocolate Crunch / Cinnamon Churro are $5.44 after 20% coupon / S&S.