Amazon offers the Pure Protein 6-Count S'Mores High Protein Bar 2-Pack (12 total) for $12.54. Add it to your cart via Subscribe & Save to drop it to $10.66 and earn free shipping. That's $0.89 per bar, and the lowest total price we could find by $10, though we saw them for a buck less in September. Worldwide Pure Protein bars are high-protein meal-replacement bars.

Of note, cancel Subscribe & Save after your order arrives (it's easy to cancel) or you'll be billed for subsequent shipments.