This is the market, an idea proposed by Manmaster and an idea that's used on several other bigger forums. The concept is player helping player, or in our case, clanmate helping clanmate. If you need an object or service provided to you, post it here before buying on the GE because it's better to help someone you KNOW instead of someone you don't know via the GE.
So, post away, anything you need, post it here and see if anyone's willing to get what you've got or if they're willing to sell what you want. Friends helping friends is how the world goes 'round, happy trading.