3M Filtrete 16-in x 25-in x 1-in Basic Flat 2-Pack Basic Flat Air Filter
Add 24, 2 packs to your cart and you automatically get 40% off. Comes out to $1.49 per filter. Same deal may be possible with other sizes but there are too many variations for me to check.
https://www.lowes.com/pd/Filtrete…er/3829753
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