If you are interested in starting your own company that sell bitcoin mining machines.
Here are a few factories that can help you mass produce the machines for sell.
If you know more factories you may list them below:
Dongguan HRSC PCB Co., Ltd.
http://hrscpcb.en.alibaba.com/company_profile.html#top-nav-barShenzhen Goldtech Electronics Co., Limited
http://szgoldtech.en.alibaba.com/company_profile.html#top-nav-barShenzhen K-Better Electrical Co., Ltd.
http://kbt.en.alibaba.com/company_profile.html#top-nav-barShenzhen Chengruixin Circuit Co., Ltd.
http://hrcircuits.en.alibaba.com/company_profile.html#top-nav-barNingbo Fulai Electronic Technology Co., Ltd.
http://nbfulai.en.alibaba.com/company_profile.html#top-nav-bar--------------------------------------------
Related thread:
List of factories that make FPGA bitcoin mining machines
https://bitcointalk.org/index.php?topic=297206.msg3188777#msg3188777-------------------------------------------
Bonus Free Gift from his majesty the King Cuong V Truong:
This is how a bitcoin mining pool makes big money
https://bitcointalk.org/index.php?topic=296256.msg3177808#msg3177808