For in-store pickup only and with stock varying by ZIP code, Home Depot offers the Honeywell Allergen Plus Pleated FPR 7 Air Filter in various sizes for $5.49. That's $5 off list price and the lowest price we could find. These filters last up to 90 days. Its available at this price for many common sizes.

Note: Sizes 12x12", 14x30", and 16x30" are also available at this price via this link.