Amazon has the 4-Oz OGX Extra Strength Refreshing Scalp + Tea Tree Mint Scalp Treatment on sale for $3.44 when you checkout via Subscribe & Save. Shipping is free.
Also available:
Amazon has the 33.8-Oz American Crew Tea Tree 3-In-1 Shampoo, Conditioner, & Bodywash on sale for $8.76 when you checkout via Subscribe & Save. Shipping is free.
Note: you can cancel subscribe & save anytime after your order ships.