We also like the Crib Futon Mattress. Each is made of natural cotton felting surrounded with wool batting in a hemp twill cover. The futons are slightly oversized to fill out a standard 28" x 52" crib. They are $250, but aren't currently available so contact them for more information.
The 100% pure wool Crib Duvet is free of bleaches and chemicals and covered with unbleached cotton ticking. Available for $90. There are tons of other baby products available on the website including diapers.