When the deal is struck, I e-mail or talk to the buyer and tell them the item is theirs (marking the item sale pending). I always ask them to e-mail back to say when they are going to send payment out, and then to e-mail again when they have to confirm that it's on the way. Sometimes people are busy and it might take them a couple of days to get payment out; that's fine, I just want to know when it's going to happen and when it does. I do the same with all my purchases-it just makes sense to keep the lines of communication open. I've never had a problem, but if a buyer did not have a legitimate excuse for sending payment when they said they would and I was uncomfortable at all, I'd re-sell the item at that time, explaining to the buyer I was going to.