Amazon has the 1080 Count Amazon Brand Mama Bear Diaper Pail Refills (00842379101182) for $12.23 - 5% off via Subscribe & Save = $11.62 with free shipping on $25+ or with Prime. Provide reliable protection from diaper odors. Each refill has 7 layers of film that work together to trap it all inside your diaper pail.

Has excellent Amazon Reviews.