Amazon offers the Playtex Diaper Genie 270-Count Refill 3-Pack (810 refills total) for $13.49. Order via Subscribe & Save to cut the price to $12.82 and bag free shipping. That's a buck under our January mention and the lowest total price we've seen. (It's also $6 below what you'd pay in-store locally.)
Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.