I take it you are looking more for wholesalers?
If so I would suggest you visit
http://www.thewholesaleforums.co.uk/forum/, Also all the company's you want are in China and they have members in Asia, so are more up to speed in that part of the world.
I searched through the forums there and found listings for.
March Technology Development Ltd;
http://www.thewholesaleforums.co.uk/...rch+Technology http://www.thewholesaleforums.co.uk/...rch+Technology
AAhandy Co., Ltd (They are in the 'Name and Shame' forum there, advise you not use them)
http://www.thewholesaleforums.co.uk/...hlight=AAHANDY http://www.thewholesaleforums.co.uk/...hlight=AAHANDY
Also, for reference purpose's I would suggest that you start a individual thread for each company. That way other people looking for a company will only find a thread for that company instead of having to go through 20 pages of info about other company's.
I'd also use caution as suppliers in China often sell fakes. In some countries customs will confiscate these and you will lose both the goods and your money.