With the recent Op factions reset we have now been left with no current auctions plugin. The only flo-auctions plugin will likely be implemented again. but here i will suggest another plugin which will create zero chat spam and make auctioning much easier and may generate a whole new way of making money in itself.
its /ah {virtual auctions house} not sure what the plugin is called but im sure someone with more knowledge can fill this in.
/ah allows players to "Auction" their items for up to 2...
Auctions Plugin