Amazon offers the Health Warrior Superfood Mint Chocolate Protein 21.2-oz. Bar 12-Pack for $14.39. Check out via Subscribe & Save to cut that to $13.67 and bag free shipping. That's the lowest total price we could find in any flavor by $4. They feature 10 grams of plant protein from a blend of chia, quinoa, oats, and peas.
Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.