Amazon offers the ZonePerfect Nutrition Bar 30-Count Box in Salted Caramel Brownie for $13.30. Check out via Subscribe & Save to drop it to $12.64. With free shipping, that's a buck less than you'd pay for this quantity in any flavor at a local retail store, with the added convenience of having it shipped to your door. (However, most flavors are at least $25 elsewhere.) Each serving contains 14 grams of protein.

Be sure to cancel your subscription after your order arrives to avoid being billed for subsequent shipments.