Phillip Crosby’s famous book, Quality Is Free, makes the argument that if you do it right the first time your organization saves the re-work cost and the yield loss cost, therefore investing in processes to achieve perfection results in free perfection.
You have more control than you may realize when contracting with off shore PCB manufacturing. See full article in Electronic Buyers News. http://www.ebnonline.com/author.asp?section_id=3907&doc_id=280498&