Where can I sell harmonicas in Changchun?

I'm from the Art Institute. Our college has a music school, and other colleges have music departments. There are music shops around them. The musical instruments there are all sold to professional students, and the musical instruments are similar. Because it is not good, professional students will not buy it. For example, there are some music shops in Jianshe Square, near the Bank of China in Hongqi Street, and also on Liberty Avenue.