Thumb Score: +78

Amazon [amazon.com] has 4-Pack Filtrete Allergen Defense Air Filter (16″ x 25″ x 1″, 1000 MPR) for $24.73 – $10.61 when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $12.88.
Shipping is free with Prime or on $35+ orders.

Savings
Save an extra $10.61 on your first Subscribe and Save order. (check and activate [amazon.com])