Hi chrstnamarie,
The tutorial post includes this link to a list of the members here that sell mattresses online and there are quite a number of them that make one or more mattresses that meet your criteria (100% natural latex with a wool quilted cover). The ones that are in the US include Arizona Premium (mattresses.net), MyGreenMattress, SleepEZ, Rocky Mountain Mattress, Brooklyn Bedding, CozyPure, Flobeds, Spindle Mattress, Flexus Comfort, and SleepingOrganic.
Phoenix