Regarding the collection of rulers, my suggestion mainly depends on the purpose. First, it depends on where you put them, home, hotel or other places. Second, it depends on where you are going to hang the work and the size of the work you want after mounting. Third, it depends on the content. If it is calligraphy, it depends on whether the content of the hanging place is appropriate.
As for the price, the landscape is 4 thousand per square foot. I bought Mr. Li's calligraphy six months ago. At that time, the price was 2500 yuan per square meter. It should be higher now.