Please tell me, where are the Taishan stones for Feng Shui use? I want to buy some.

It’s not necessary. Just go up the mountain to find a bigger stone and carve the word Taishan on it when you come back. But it is best to do Taoist consecration treatment. The serious Taishan stone is three feet six long and one foot two wide, and half of the stone is buried underground. If it's convenient for you, you can go to a dry marble shop and ask them to make one for you. Just write the word "Taishan" on it. Very simple. Now I don’t make marble, otherwise I can help you process it, haha.