Walmart offers Filtrete 14x20x1, Allergen Defense Micro Particle Reduction HVAC Furnace Air Filter, 800 MPR, Pack of 3 Filters for $15.88 plus $5.99 shipping or free ship to store.

Product Description:
Not sure which Filtrete device or filter to buy? Click here to view our help guide. Opt for a Filtrete™ Pollen & Pet Dander Air Filter to transform your central heating and cooling system into a whole home air filtration operation. This no nonsense filter helps capture varying sizes of particles, from the large (lint, pollen, dust and pet dander) to the microscopic (smoke and smog).