Retin-a is used to treat Acne, Skin Cancer. The generic version is called Tretinoin. The average Retin-a cash price is about $80.08 for a supply of Cream 25 % 30 pcs. You can reduce your Retin-a cost by up to 75% with our free Retin-a discount card. Bring it to a participating pharmacy near you to save on your prescription medication.