From Zelda Dungeon Wiki
How to Get It
The Zora Tunic can be obtained two different ways:
- Get it from King Zora after reviving him with Blue Fire that is found in the Ice Cavern. He gives it to Link for free.
- Purchase it from the Zora Shop in Zora's Domain. Link must also use Blue Fire to unblock the entrance to the shop. The shopkeeper charges 300 Rupees for it.
The first option is clearly the best, it saves Link 300 Rupees!