Excuse me, does anyone know how much a square foot of bamboo is by China painter Ai Qingyun?

Ai Qingyun, male, born in August 1938, senior academician, art consultant, first-class painter, university culture. Good at China painting and calligraphy (good at painting bamboo). Main artistic group positions: Director of the World Association of Painters and Calligraphers, Professor of China Calligraphy Research Institute.

Checked the recent transaction records, about 200-300.