Amazon offers the Pringles 2-Flavor Snack Stacks 0.63-oz. 18-Count for $6.48. Order via Subscribe & Save to cut the price to $6.16 and bag free shipping. That's about a buck below what you'd pay in-store locally. It includes original and sour cream and onion flavors.

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