Online shop of specialty Japanese ingredients - Page 3 has "Hokkaido Pesticide Free" organic brown Japanese rice which you can order in bulk (2kg, 5kg or 10kg bags). 

專營日本食材的網上商店，產品包括北海道不含農藥有機糙米，可大量訂購(兩公斤、五公斤或十公斤裝)。