Amazon has the LEVOIT Core 300-P Replacement Filter (Core 300-RF-PA) for $36 - 30% off (check “Save an extra” box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) - $10 off at checkout = $15 with free shipping on $35+ or with Prime (extra 15% off for 5 subscribe and save orders).