Thumb Score: +22

Amazon [amazon.com] has 1-Oz Differin Acne Spot Treatment w/ 10% Benzoyl Peroxide for $8.39 – $3.00 – 40% when you ‘clip’ coupons on product page – 5% when you check out via Subscribe & Save = $1.61.
Shipping is free with Prime or on $35+ orders.

Savings
Coupon price $5.39 (clip on the product page)
Save an extra 40% on your first Subscribe and Save order. (check and activate [amazon.com])