I want to purchase some connectors (RCA, BNC etc) from Taiwan and ship them to China where the majority of the shipment is located and consolidate shipment. Then export everything out of China to US. My question is that if I do it this way, will I be paying duties and custom for the connectors from Taiwan to China then another duties for the whole shipment from china to US? If that is the case, I am paying double duty for the connectors and are there any bonded warehouses in Northern China, around QingDao Shandong area?

Thanks a lot