How much does a poster card set sold by COSER generally cost? How to buy? Will there be many people? When did you start selling?

I am from Dalian, and the exhibition hall is not very big. In our case, posters range from 15 to 20 yuan, but I have never bought a set of cards. Posters are sold at general booths. Of course, if you are signing a book, there will be one near the book signing. There are not too many people, but you still need to wait for a while. Ordinary booths usually start selling at the beginning of the comic show, but if it is near the autograph signing, we will sell it before the autograph signing starts. Hope this helps you hehe.