Yes, I realize the date of this thread. Regardless, I want to add two things.
First, not China based, but interesting products that can be retro fitted into existing vehicles. Good for ideas, etc:
hotrodair.com
Second, here is a neat example of alibaba in use. This thread starts out about something else, then developes into actually getting a product from that website. You can see the whole process play out:
turbomustangs.com/smf/index.php?topic=72657.0