Unless you have tuck loads of spare cash, not even worth thinking about branded phones. China is another matter altogether, very simple to purchase non-branded phone, actually it's simple to purchase FAKE branded phones form there as well.
Not suggesting anyone buys fake, just making the point. In regards to buying from a Chinese supplier/manufacturer, it's as simple as sending them an email with your purchasing requirements and that will open a dialogue between you.
From there, business can start flowing if you both come to agreed trading terms.