Thumb Score: +16

Amazon [amazon.com] has 4-Pk Energizer Max 9V Alkaline Batteries for $11.69 – 40% at checkout – 5% when you check out via Subscribe & Save = $6.43.
Shipping is free with Prime or on $35+ orders.

Savings
40% off coupon applied at checkout. Subscribe & Save orders only. (check and activate [amazon.com])