In Destiny each weekend the Tower will play host to a special vendor that sells valuable and high priced rare legendary or exotic items. Using Strange Coins which are collected from battle and various tasks in Destiny you can use these to get some serious fire power from the guy. For those with smaller quantities of the coins he has consumables that can also be purchased to assist in combat. So once more the leader of the nines can be found Friday to Sunday and is located just within the lower area of the main tower. Checkout this video of the Strange Coins Vendor from Skycaptin5lol below.
Stange Coin Vendor Video