Amazon offers the Pringles 3-Flavor Snack Stacks 18-Pack for $6.48. Checkout via Subscribe and Save to cut that price to $6.16. With free shipping for Prime members, that's the lowest price we could find by about $1, although most $18 or more. (We saw it for a buck less last August.) It includes six packs of original, cheddar cheese, and sour cream and onion.

Note: Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.