What is the recent market price of calligrapher Chang Zhicheng's works?

I just bought it a few years ago and gave it away. It seems that old works have been rising in recent years. 12 seems to be about 10000 feet when I bought it. It has more than doubled recently. Of course, the price of painting and calligraphy works depends on the content and quality. Generally speaking, the market price is around 30,000-40,000 feet. The works with connotation are still worth starting with, hoping to help the landlord.