Amazon offers the Holmes Group HAPF600DM-U2 True HEPA Filter with Enhanced Mold Fighting Power (2 Pack) for $20.57.
Holmes True HEPA Filter with Enhanced Mold Fighting Power
Helps remove up to 99.97 percent of airborne particles as small as 0.3 microns
Including different types of pollen, mold spores, household dust, pet dander and smoke [ Shop Now ]