Amazon offers the Orville Redenbacher's Microwavable Butter Popcorn 3.3-oz. Bag 36-Count Box
for $6.51. Order via Subscribe & Save and it falls to $6.18
with free shipping
. That's $0.17 per bag and by far the best price we could find for this much Redenbacher's microwavable popcorn. (Several merchants charge close to the same price for a 10-pack before shipping.)
Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.