Hello Mr.Jaw Fei:

You can buy them in another city named Foshan.It is not far from Guangzhou city. I usually go there with foreigners about once in a week to buy the sanitary ware and ceramic, because I am a translator. There are some large wholesales markets in the places such as Chancheng,Nanhai ,Shunde ,Shiwan and Shagang.If you need a help ,I can help to give you much more information about it.

Good luck!