Best Buy: Heaven Fresh Replacement HEPA / Activated Carbon Filter for NaturoPure™ HF 300C Air Purifier Blue HF300-FILTER
LifeSupplyUSA 6 in. x 12 in. x 0.5 in. Replacement HEPA Filter with Activated Carbon Fits Heaven Fresh Naturopure Air Cleaner Purifier ER352A - The Home Depot
LifeSupplyUSA 11x13x1.25 Replacement 2-in-1 HEPA Carbon Combination Filter for Heaven Fresh HF 380 Air PurifierxJ-3800 ER678 - The Home Depot