How much are the calligraphy works of modern famous calligrapher Xu Rongshuang?

Xu Rongshuang, pen name Yan Mo, owner of Tenglongzhai, is a famous contemporary calligrapher in China. Hua county, Henan, 1957, disciple of Mr. Chairman of China Calligraphers Association. His works won high prices at many large auctions. One of his works of art, a landscape painting, is 6 feet and 380,000 yuan; A calligraphy work, 6 feet 290 thousand.