4-Pack of Enviroflow Pollen and Dust Control Air Filters from $14.99

Traps dust and allergens such as pollen, mold, pet dander, and dust mites and keeps them from recirculating via your HVAC system
Electrostatic pleated media, which performs better than regular fiberglass fibers
Still allows for plenty of air flow, ensuring little extra strain is put on furnace or AC
Efficiency up to MERV 8
Each filter lasts up to 90 days