Amazon offers the Pantene Aqua Light Weightless Nourishment 2-In-1 Shampoo & Conditioner 12.6-oz. 2-Pack for $3.13 with free shipping ($1.57/bottle) via the instructions below. That's $1 under our June mention and the lowest total price we could find by $3. To get this deal:
View the Pantene Aqua Light 2-In-1 Shampoo & Conditioner 12.6-oz. 2-Pack for $6.98
Step 01: clip this 50 cents off coupon
Step 02: clip this $3 off coupon
Step 03: add the shampoo/conditioner 2-Pack to your cart via Subscribe & Save for a final price of $3.13

Be sure to cancel Subscribe & Save once your order arrives, or you'll be billed for subsequent shipments.