That depends on what product you are trying to buy. Is it a rare and diffuclt to find product?
Perhaps they know you are new and wahts to take advantage of you.
Did you do your research? having a bifg fat cheque book does not replce research.
Did you find a local contact?
Did you get quotes from other suppliers?
It depends upon the product.
For example, if you were trying to buy legitimate foreign brand name products then you would have been buying at retail prices as you cannot buy these products in China directly.
So perhaps you can give more information about what products you were trying to buy?
Clearly China prices are competitive otherwise no one would buy from China.