You have met the bad suppliers? Or you are worried about the scammers before ordering.
If you did, we can help you. Please see the following:
This is china- know- all in china.
(1)?Suppliers due diligence ?--- due diligence, provide a report of due diligence.
(2)?Providing some useful information? as: illegitimate suppliers? list, quotation, law, hotel, airport and etc.  
Just feel free to contact with me and try our service and information. For the first, we don?t take any fee.