Hi, can give you my story from Czech republic.
I ordered two cameras from gearbest. The real price was 98$. Post stops it for taxes and on package was price 19.98$. I found on gearbest invoice to 19.98$. Post wants from me: invoce from eshop, printscreen from eshop, paypal account history. So I send them only invoice what I download from gearbest, prinscreen where I change price from 98 to 19.98.
At the end I only pay 90CZK for shipping from post. (its prox. 3$)
I think that better chinese shops can give you on invoice or package what price you want after you contact them.