Thumb Score: +22

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 (clip on the product page)
Save an extra 40% on your first Subscribe and Save order. (check and activate [amazon.com])