Today November 15th only, Home Depot takes up to 46% off select Air Filters! Plus, you’ll score FREE shipping too! Grab Allergen Plus Pleated FPR 7 Air Filter (4-Pack) for only $19.99 shipped! (Reg. $37.29) There are a lot of different sizes too. So hopefully you can find one that can fit your needs. This is a great price to stock up on!