In Guangzhou, there are also many exchange shops like Hong Kong. Actually, it depends on whether the store you go to is formal or not. Regular exchange shops are franchised by the State Administration of Foreign Exchange, and generally use bank prices, which is more convenient than bank exchange. I know that the joint currency falls into this category. The fly in the ointment is that I live in Henan and Guangzhou, but I don't have a branch. Generally, you have to go to Tianhe or Yuexiu to change it, but it is definitely faster than the bank.