I currently reside here in South China. I'm a native English speaker and also fluent in Cantonese/ Mandarin.
I believe your looking for a good quality T-shirt supplier, which I can get hold of for you. Although I want to specifically ask, are these T-shirts just plain T-shirts? I.e. Just plain black, white, etc. Or are there any patterns or brands you wanted on them.
Are these t-shirts for any specific application, i.e. sports wear, casual, freebies, uniform, promotion purposes, etc.
Look forward in hearing from you soon.