What is the price of the calligraphy works of Mr. Shu Guanguan, the son of Shu Tong and a member of China Book Association?

Art works, especially calligraphy works, are often valuable but not marketable when the development of art and culture in China is relatively backward and the level of public appreciation is low. Famous calligraphy is still good. If it is a painter's work that is neither red nor purple, it can only be a few hundred yuan.