BTC China has a voucher system. But I have no idea how that works. If someone can explain, that would be great.
The BTC China voucher system is basically like buying a gift card - that can only be used to buy BTC on BTC China. The problem is that a big part of their network of retailers who sold these vouchers were on Taobao (China's Amazon) - who have sinced banned the sale of anything bitcoin related. So the voucher system is all but dead
BTC China also set up a "Maker-Taker" system, which essentially promotes the sale of BTC between users, which is allowed under the new Chinese regulations.