How much does Li Derun’s calligraphy and painting work cost per square foot, how to identify it, and where to buy it?

Jin Dajun, also known as Aixinjueluo Dajun, occupation: painter, born in Beijing in February 1948, Manchu, descendant of the Aixinjueluo family, Prince Yu Duduo, the fifteenth son of Nurhaci, Taizu of the Qing Dynasty Twelfth generation grandson. Among many calligraphy and painting artists, their works are not very outstanding, and the price is only tens of thousands per square foot or even lower.