The secret to all this is building a business that is trustworthy and reliable.
Companies want vendors and suppliers who can quickly and easily handle a job. Companies have their own core business and do not want to be bothered with duplication techniques, supply issues or digital duplication work. By offloading that work to a third party vendor, like your new (USB Duplicator) company, it makes your client more focused on their work... not your work.
As with any business it is important to be organized and present yourself as an organized company. Without the ability to quickly provide information, quotes, call backs and resources it builds doubt in the customer's mind. Although USB flash drive duplication services is not a very competitive market, it is still very important to ensure your customer stays with your business. If you are not organized and present yourself as a trustworthy supplier, you should always work with each customers is if they are the most important.