Oldman, Maybe you could just go to the classifieds forum and place a WTB ad for the barrel you want. If the person trading the barrel wants to sell they could then take it off the trading forum and contact you about buying it. If not someone else might have the same barrel they could sell you. that way I dont think it would be unethical or go against the spirit of the trading forum. Just a suggestion.
This is why I seldom look at the trading forum, as I only have one barrel for now and I want to keep it.
BruceP