This is a great product and well worth the less than $5 price tag. It works well if used properly. I use it in sections spraying at the roots and combing through. It worked best for me if I teased the roots a little afterward. It will leave a white cast on the roots if not combed through or worked into the hair. The color will disappear once all the oil is absorbed.
If you are looking for a dry shampoo, but don't want to pay the high end price, this is the product you.
This product is available at Wal-Mart. Check your local drugstores for availability.