Black castor oil is sold at online retail websites, such as Amazon.com and JamaicanBlackCastorOil.com. As of 2015, prices for Jamaican black castor oil range from $1 to $2 an ounce, according to Amazon and Jamaican Black Castor Oil Distributors.
Customers can purchase regular, lite or extra-dark Jamaican castor oil, notes Jamaican Black Castor Oil Distributors. The product is also available with additives, such as lavender and rosemary, or in hair and skin care products, such as shampoo and lotion.
Castor beans are roasted, ground and then boiled to create castor oil, explains Black Girl with Long Hair. Ash from the roasted castor beans is added to create black castor oil. Manufacturers claim that the ash adds to the effectiveness of the product, but there is no research to support this claim, as of 2015.