Thumb Score: +26

Amazon [amazon.com] has 24-Count Swiffer Sweeper Wet Mopping Cloths (Open Window Fresh) 3 for $24 – 20% (multibuy discount) – 5% when you check out via Subscribe & Save = $18.
Shipping is free with Prime or on $35+ orders.

Savings
Save 20% on 3 when you buy 3 (check and activate [amazon.com])