https://www.homedepot.com/p/HDX-14-...011430/315964771?irgwc=1&cm_mmc=afl-ir-10451- select HDX Superior Allergen Pleated Air Filter FPR 9/Merv 12 (various sizes) on sale 4+ on sale for $9.49/filter (Bulk Price Eligible Discount) = $37.96. Shipping is free, otherwise, select free store pickup as an alternative option.