Winix 115115 True HEPA Filter A (Fits 5300-2, C535, 6300-2, P300) $28

Amazon has Winix 115115 True HEPA + Carbon Replacement Filter A on sale for $27.99. Shipping is free with Prime or on $35+ orders. Alternatively, Home Depot has Winix 115115 True HEPA + Carbon Replacement Filter A on sale for $27.99. Shipping is free or choose store pickup where stock permits.