Thumb Score: +30

VACPLUS via Amazon [amazon.com] has 12-Pack Vacplus Toilet Bowl Cleaning Tablets for $8.49 – 50% when you ‘clip’ the coupon on product page – 5% when you check out via Subscribe & Save = $3.82.
Shipping is free with Prime or on $35+ orders.

Savings
Extra 50% on the first order. (check and activate [amazon.com])