Home Depot has the Honeywell Allergen Plus Air Filter (4-Pack) for only $19.99! (Reg. $37.29) You can choose your size that you need. This is a great time to stock up and be ready for when you need new ones. That way you won’t be paying full price when you run out. Shipping is FREE when you spend $45 or more. Or, choose in-store pickup to save on shipping.