Rice hulls are generated by the milling of rice and thus are usually located and sold at rice mills. As this is a mill byproduct, the hulls must be removed or disposed of on a regular basis. Mills usually have contracts with different organizations for this (including animal feed and bedding companies) but can sometimes provide small volumes on a first-come-first-serve basis. In order to determine availability in your area, please contact the nearest rice mill to your location. A list of mills can be located by visiting industry trade association websites.