Sell on FB or once upon a child?

I didn't know where to post this so sorry if its breaking any rules.

I'm needing to sell these two items to clear up space in my son's room. What would be the better place to sell them? Once upon a child or Facebook? I've heard once upon a child rips you off? Also if you were to sell them on Facebook how much should I ask for each? They are both in great clean condition. My son never even showed interest in them 🙃 however my dogs sure loved all the balls in the ball pit so those are gone lol.