Visit the SimpleRegionMarket dbo page
SimpleRegionMarket is the most comprehensive Region Market plugin available. It allows users to buy/sell, rent, lease, and auction WorldGuard regions. Putting your pre-configured WorldGuard regions on the market is as simple as creating a sign. Players can simply click on a sign and are automatically granted WorldGuard region owner or member status. Financial transactions are managed through the Vault enabled economy plugin of your choice.