Rogaine Men's Thickening 2-in-1 Shampoo & Conditioner 8.4-oz. Bottle for $9.49 via Sub. & Save + free shipping w/ Prime

This Rogaine Men's Thickening 2-in-1 Shampoo + Conditioner is $10 at Amazon, down from $14. It's the best deal we could find by $5. The formula includes rosemary oil, keratin, and citric acid, and is safe to use alongside a minoxidil treatment since it doesn't contain minoxidil itself. Buy Now at Amazon