Arm & Hammer Air Filters, 12-Packs | $55 | Home Depot

You all know this, but replacing your air filters is the cheapest way to improve the air quality in your home, removing funky smells and allergens. Home Depot is selling a whole bunch of 12-packs of Arm & Hammer air filters for just $55 today. So go ahead and stock up before spring allergies swarm in.