Art galleries generally sell China's calligraphy and painting supplies.
There are many antique markets, and most shops selling calligraphy and painting supplies only sell calligraphy and Chinese painting supplies, not western painting materials such as oil paintings and watercolors. The price and quality are also very good. You can choose for yourself. This kind of shop is not like selling antiques, killing customers with fake antiques. It is difficult to choose the brush, and it is suggested that the price range of 40~ 100 yuan is more acceptable.
And the Academy of Fine Arts. Personally, I think there are many kinds of western painting materials sold next to the Academy of Fine Arts. But China's calligraphy and painting materials are very ordinary, and there is nothing better. Of course, it is also possible that your city has a large art college and a strong China painting and calligraphy major, which may be different.