Thumb Score: +19

Amazon [amazon.com] has 6-Count Brita Plus Water Filter Refill for $22.91 – 5% when you check out via Subscribe & Save = $21.76.
Shipping is free with Prime or on $35+ orders.

Subscribe & Save
5%: $21.76
10%: $20.62
Add to next delivery [amazon.com] (with free shipping)