For Prime members only, Amazon offers the Pampers Cruisers Economy Plus Diaper 174-Pack in Size 3 for $36.79. Add it to cart via Subscribe & Save and the price drops to $29.43. With free shipping, that's $0.17/diaper and the lowest total price we could find by $8, although most merchants charge at least $46. These diapers feature a 3-way fit system.

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