A best bet is the
Kellog's Special K Chocolate Peanut Protein Snack Bar 18-Pack (pictured) for after the Subscribe & Save discount. That's $9 under the lowest total price we could find for this quantity elsewhere. It comes with three boxes containing six bars each.
$7.98 with free shipping
Be sure to cancel Subscribe & Save once your order ships or you'll be billed for subsequent shipments.