Amazon offers the Tresemme Expert Selection Renewal Hair & Scalp 25-oz. Conditioner for $3.70 with free shipping, via the directions below. That's the lowest total price we could find by $1, although in July we saw it for a buck less.

1. View the Tresemme Renewal Hair & Scalp 25-oz. Conditioner for $4.94
2. clip the 20% off coupon on the product page
3. add to cart via Subscribe & Save for a final price of $3.70