Amazon has the Differin Gel Acne Scar Spot Treatment Gel for Face Resurfacing Scar Gel (1 oz) for $12.49 - 5% off with Subscribe & Save (can cancel anytime) = $11.87 with free shipping on $35+ or with Prime (extra 15% off for 5+ subscribe and save orders). Walgreens has it for $12.49.