" Merchant bank has always a good rate.
If change alot, get someone in the business to do it.
For just a few thousand USD, there are many people/shops near Nanfang dasha or Xiaobei subway to do that. But you need to trust, that is an issue."
"If you may want to change back into USD in the future, I suggest you consider China Bank. I changed some SGD last week and surprising they have this arrangement of which you can change the same amount back within 2 years at the same rate…"