Is it possible to sell old books at one of the bookstalls in ymca bookfair?

I have a few books I have read and won't re-read and some new books I don't want, so I want to sell them. I'm going to the bookfair on Monday and is it possible to sell them there? (And I don't want to donate them since I want to use this money to buy new books) If you guys have any idea lmk