Amazon offers the Trident White Gum 180-Count Bag in Peppermint for $5.98. Add it to your cart via Subscribe & Save and the price drops to $5.68. With free shipping, that's the lowest total price we could find by $6, although we saw it for a buck less in June. This sugar-free gum purports to fight cavities.

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