I have had the fortunate experience of visiting this incredible 'village' of pottery in XiXing China. It was long bus ride from where I was staying in Shanghai but well worth it! Needless to say I purchased thousands of dollars worth of pots to be shipped back the the USA and this was back in 1999. (I still have a few but needless to say one can never have enough bonsai pots...LOL)
If you go to China you must see this place!