Sourcing for t-shirts manufacturer contacts in Guangzhou

Looking for: Listing of manufacturers for plain colored cotton t-shirts in Guangdong province, China especially in Guangzhou and Shenzhen. Manufacturers have to be able to take small orders of 500 to 2000 pieces of assorted sizes per order. I am looking for someone who can provide a list of current companies, addresses and contact information of manufacturers that I can visit and make contact with personally. Listing have to be specifically for manufacturers of plain t-shirts and NOT unfiltered list of garment manufacturers lifted from trade directories or internet sourcing sites. The quality and reliability of the listing matters more that how long the list is. There are other specific items that I need to source around Guangzhou region and is looking for someone who can provide reliable information whom I can work with on an on-going basis when such need arises.