What is the value of Xie Deping's calligraphy?

The late famous calligrapher Xie Deping (1939-2000) was a native of Sanyuan Luqiao, a researcher of the Ministry of Culture, the president of China Academy of Sciences, a member of China Calligraphy Society, and the president of "Tian Fei" cursive research society. After writing in Weihai, he returned to Beijing and went to Xi on the same day. Unfortunately, he died in a foreign land. His works have high collection value. He created "Rolling Dragon Body" and "Flying Body" with the beauty of Dunhuang murals as the image. 84cm× 60cm high and wide, paper book, price 15000.00 yuan.