Thumb Score: +18

Amazon [amazon.com] has 0.5oz Differin Acne Treatment Face Gel w/ 0.1% Adapalene (30-Day Supply) for $13.48 – $2.99 – 40% when you ‘clip’ coupons on product page – 5% when you check out via Subscribe & Save = $4.43.
Shipping is free with Prime or on $35+ orders.

Savings
Coupon price $10.49 (clip on the product page)
Save an extra 40% on your first Subscribe and Save order. (check and activate [amazon.com])