you gotta find an agent. you have to pay to convert USD to Yuan, then pay to have them shipped to the agent, then pay the agent his cut (8%-10%) and then pay for shipping to you, then others have to pay shipping to them.
it can add up quickly. those boards are not that rare in the US. if they were MX boards i'd for sure say go for it.
and like demik said, 90% of the vintage stuff on taobao isn't actually in stock...they sell them and then never adjust the inventory.