The Chinese are extremely price sensitive. In international trade, prices are quoted very reasonably as the price in the market is relatively transparent. Price would be affected by such factors as raw material and energy price, tax rebate rate, labor price, currency appreciation, and etc. You should do your homework well before having a price negotiation.
(1) Do some research of tax rebate rate, raw material price, and currency exchange rate.
(2) Do some research of the market. Search the target products on Made-in-China.com, and figure out the price of the market.
(3) Export companies in China normally quote a reasonable price and price is relatively transparent. You can’t expect to cut the price down by something like 50% or more.