Amazon offers the Pringles 3-Flavor Snack Stacks 18-Pack for $6.02. Checkout via Subscribe and Save to cut that price to $5.72 and bag free shipping. (Target offers it for pennies more.) That's the lowest price we could find by about $1. 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.