Merchant's Oath

Merchant's Oaths are unwritten agreements between Zunari and the Goron Merchants in The Legend of Zelda: The Wind Waker. After receiving the Delivery Bag and saving the girls from the Forsaken Fortress, Link creates these oaths for Zunari by trading certain items with the merchants. These items are flowers, flags, or other forms of decoration that are traded to be upgraded. Each of the trades costs a certain number of Rupees (usually between 20 and 100).

Trading Chart
Below is a list of each decoration item and what it can be traded for at each Goron Merchant (at Bomb Island F5, Child Isle B2, and Greatfish Isle B4):
 * IMPORTANT NOTE: This chart only works after all the Goron Merchants have been traded with (at least) once each!

Shop Guru Idol Guide
The quickest way to get the Shop Guru Idol (and thereby a Piece of Heart) is as follows:
 * 1) Town Flower for Sea flower (any)
 * 2) Sea Flower for Exotic Flower (Greatfish)
 * 3) Exotic Flower for Sickle Moon Flag (Child)
 * 4) Sickle Moon Flag for Fountain Idol (Bomb or Greatfish)
 * 5) Fountain Idol for Big Sale Flag (Child)
 * 6) Big Sale Flag for Hero's Flag (Bomb or Greatfish)
 * 7) Hero's Flag for Postman Idol (Greatfish)
 * 8) Postman Idol for Shop Guru Idol (Child Isle)