Amazon has 25.6oz of Quest Nutrition Protein Powder (Cinnamon Crunch) for $26 - 5% off with Subscribe & Save (can cancel anytime) - 35% off coupon (check "Save an extra" box, eligible on first S&S order for this product) = $15.67 with free shipping on $25+ or with Prime.

Other flavors also have the coupon, but are slightly more after discounts.