What is the price of Xie Quansheng's calligraphy?

I saw a pair of official script couplets (3㎝*23㎝) in the collection market a month ago, and later I heard that I bought more than 2, yuan. Based on this conversion, Xie's works are about 2,-5, yuan per square foot. Prices should be set according to the quality of their works.

I hope it helps you!