The Happy Mask Shop

The Happy Mask Shop is found in Hyrule Market in Hyrule Castle Town in The Legend of Zelda: Ocarina of Time, to the right of the entrance to Hyrule Castle.

It is the base for the game's Mask Trading Sidequest, and is run by the Happy Mask Salesman.

The shop will open after you give Zelda's Letter to the guard in Kakariko Village.

Masks available:

 * Keaton Mask
 * Skull Mask
 * Spooky Mask
 * Bunny Hood

Non-saleable Masks:

 * Mask of Truth
 * Gerudo Mask
 * Goron Mask
 * Zora Mask