hair fatory in guangzhou

I’m traveling in a few weeks. I am interested in buying hair extensions for African American texture. In the states we call it "perm straight".
I am also interested in buying I’m look for 100% virgin hair and maybe some custom half wigs.

Can anyone recommend any places to go?

Also are there any tips to ensure I’m getting 100% virgin human hair?
Anything I need to make sure that I check for when buying hair?