1. Bookstores: Many large bookstores or art supply stores have special areas for selling brushes. You can go to your local bookstore or art supply store to look for brushes that suit your needs.

2. Professional art supply stores: Some stores that specialize in supplying artist supplies usually have a wider selection of brushes. These stores usually offer higher quality brush options for professional painters to purchase.

3. Online shopping platforms: There are also many online shopping platforms that supply brushes on the Internet, such as Taobao, JD.com, Amazon, etc. You can search for different brands and types of brushes on these platforms, and choose the right brush through user reviews and product descriptions.

4. Art supply exhibitions: Attending art supply exhibitions is also a good choice. These exhibitions will have many booths supplying brushes. You can directly find and buy your favorite brushes at the exhibition.

Different regions will have different purchasing channels and stores. It is recommended that you search locally first or consult local art lovers or professionals to obtain more accurate information.