How much is Ouyang Mingde's calligraphy worth?

How much is Ouyang Mingde's calligraphy worth? Ouyang Mingde, born in 1949, is a member of Hunan Senior Painters Association. In 20/0/4, Kloc won the first prize of the International Overseas Chinese Exhibition, and was shortlisted for the "Tai 'an Cup" painting and calligraphy competition in the same year. The work has not been retouched, and the current market valuation is 1000-2000 RMB per square foot.