eBay may have its flaws, but at least it makes clear what is being offered and for how much, and produces/requires some commitment on the people involved. It also makes buyers feel safer; I doubt Paypal would do much with a complaint about a deal with a random guy on a forum.
So all in all I have to second Pinchpenny's suggestion here. You can set a reserve if you're worried about not getting what you feel these things are worth. Obviously you could go through some other site instead if you prefer, but eBay's reputation and popularity do have their upshots as well.
although we do still have a time machine, so I wouldn't completely rule out the possibility.