We have a natural latex bed from Land & Sky (Lincoln, NE). We've had it for 5ish years and are quite happy with it. We visited the factory before purchasing and were pleased with the facility and staff. Our is 3 layers of 3" latex and you can customize your firmness at each layer.
Our crib and twin mattresses are also natural latex and we got them through Organic Grace. It is a company out of California but they ship and are really great to work with. Talia is fabulous for getting your questions answered.