Quoted from o-din:To be fair, it is clearly listed OBO... or best offer.
Or best offer means just that. It may be less than $313 or it may be more.
Anytime I see OBO, I always assume the seller will consider all offers until he's ready to sell it.
I always assume the buyer is willing to sell at the list price, and may entertain offers below the list price. Not, "You know, I'm not sure if I want to sell it at this price, so offer me more."