我要到那里才可以找到采购电源适配器的商人呢？where can i find a people of purchase power adaptor
我要到那里才可以找到采购电源适配器的商人呢？where can i find a business people of purchase power adaptor

Question

我要到那里才可以找到采购电源适配器的商人呢？where  can i find a people of purchase power adaptor 
我要到那里才可以找到采购电源适配器的商人呢？where  can i find a business people of purchase power adaptor

Answer

Where can I find a store that sells power adapters.
OR
Where can I go to buy a power adapter.
[This phrase would work whether you are asking about a physical store or one on the internet]