Thumb Score: +21

Amazon [amazon.com] has 2-Pack Filtrete 20x30x1 Air Filter, MERV 11, MPR 1000 for $33.28 – $19.97 when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $11.65.
Shipping is free with Prime or on $35+ orders.

Savings
Save an extra $19.97 on your first Subscribe and Save order. (clip on the product page)