May I ask the price of Sun Shengnian's calligraphy works in Beijing?

Sun Shengnian,1born in June, 932, was born in Yantai, Shandong. I like painting and calligraphy since I was a child. I studied under Mr. Qi Gong in my early years and later became a disciple of Mr. Xie Bingyan. Good at regular script and cursive script. He is currently a member of China Calligraphers Association, vice president of the Calligraphy and Painting Society of the Ministry of Culture and vice president of the Calligraphy and Painting Society of Old Artists of the Ministry of Culture. The price is 500- 1000 RMB/frame (four feet).

Ma, alias Zhongliang, 1954 was born in Xiangcheng, Henan Province in February. He is currently the deputy director of the Office of Shanxi Higher People's Court, a member of China Calligraphers Association, a director of Contemporary China Young Calligraphers Association, a director of Shanxi Calligraphers Association, a director of Shanxi Poetry, Calligraphy and Printing Federation, and a senior calligrapher of Zhongyuan Calligraphy and Painting Research Institute. His calligraphy style suits Yan and Su Dongpo. His works are elegant, simple and subtle, and he has participated in calligraphy exhibitions at or above the provincial level for many times and won awards.

From the training of calligraphy system, he has some basic skills, but he is full of craftsman spirit. His price is 1000-200 yuan RMB/rack (four feet). The collection value is not great, and there is not much room for appreciation.