Filtrate Basic Flat Panel 2-Pack Basic Flat Air Filter 40% off. as low as $1.62 per filter + free shiping

Lowes is having a 40% off sale on Basic filter. Various sizes available. Free shipping or you can do store pickup for $5 of $20 coupon.
you must by 24 count to get the discount.
e.g. this one is $3.24 per pack (has 2 filters) or $1.62 per filter.