For better deal always try to use escrow service from forum. Just search simply you will get who is providing escrow service or make a post for help.
Account sales is allowed, but the forum community generally kicks against it, and for good reasons. Getting a trusted escrow to supervise the sale of an account on the forun may not be possible as members tend to steer clear of such trades.
Even without being logged in, one should be aware of the obvious threat of scams if they have been reading around the forum and learning a thing or two, maybe the admins would consider your suggestion.