Amazon has a 27-Pack of Pringles 3-Flavor Snack Stacks for $11.38 - 5% off with Subscribe & Save (can cancel anytime) - 20% off (check “Save an extra” box, eligible on first S&S order for this product) = $8.53 with free shipping on $25+ or with Prime. Roughly 36 cents per pack.

• Includes 9 of each: Original Flavor, Sour Cream & Onion, Cheddar Cheese