Castle Lite & Castle Milk Stout Distributor

Does anyone know where I can purchase castle lite and castle milk stout. I saw some bars in Kiambu Road stocking this brands yet I can't find any contacts za distributors.
I think that everybody liked Milk Stout. It has such a great taste and many people preferred to consume it. I dont really know what actually happened to vanish from the local market, so it would be nice to know where can it still be bought