I come from Humen, a local town.
If you want to wholesale things like walnuts and nuts, you can go to Humen Old Street (near Intimate Park), where the market is a bit old, but the things there are very cheap. Many shops buy goods there, and there should be a fruit market nearby.
Either go to Humenzhai Market or Humenzhai Market, both of which are in the city center and very close.
I hope I can help.