I purchased my castor oil supplies from The Heritage store online. They sell all of Edgar Cayce 's recommended formulas. As they sent the olive oil shampoo free, I just looked it up to see what it cost. I see they also have a Dandruff Relief shampoo as well as a Pine Tar shampoo. They cost $5.50 and $8.00 respectively. Similar to what I used to pay for Head and Shoulders Dry Scalp. You can check out their website below. Either of these two might work much better as they are targeted specifically towards dandruff and/or dry scalp. I will probably try them as well.