Alpine Provisions' castile soaps ("Castile Soap is truly one of life’s little miracles: made of a rich combination of organic Olive and Coconut oils, this super concentrated, highly effective, yet wonderfully gentle cleanser can be used on both skin and hair") are 100% biodegradable and organic, and they're available in Fir + Sage, Lavender + Juniper and Cedar + Sandalwood. 473 ml for $12 each at Luckyscent.