Old English, I hear on that, been burned a few times myself. Usually if I call and talk to some one and the item(s) is still available I tell them I'll be by to pick it up and pay for it the next day. I then go to get it only to find out the seller sold it to a person, several calls after mine, who could pick it up the same day as the add ran.
I mean I told them I'd take it, that, to me, means "SOLD." Then to sell to someone else is breaking an oral sales contract.