If you are going by Walgreens, they have Herbal Essence on clearance. Make sure to take a look at the Christmas clearance also.
Buy 2 Aussie or Herbal Essences Clearanced to $2.39 each
Use B1G1 Herbal Essences or Aussie Styler from PG 12/26
Also use 1 $0.50/1 Herbal Essences from RP 11/14
Pay $1.89, Receive a $1.00 Reward
Total: $0.45 each
Thanks Wild for Wags!