Thumb Score: +18

Amazon [amazon.com] has 4-Oz Differin Acne Face Wash Daily Deep Cleaner w/ 5% Benzoyl Peroxide for $9.79 – $3.00 – 40% when you ‘clip’ coupons on product page – 5% when you check out via Subscribe & Save = $2.38.
Shipping is free with Prime or on $35+ orders.

Savings
Coupon price $6.79 (check and activate [amazon.com])