I've seen one on the East First Ring Road.
Then there is one at the intersection of Renmin Middle Road and Xinmin Road (opposite the computer).
There seems to be one near Zall Jewelry in the city center ~ ~
Well, I've only seen these, because I'm also interested in learning these things, but I don't have time to learn them. I just have time to study by myself, and I will pay attention to these places when I pass by, hehe.