Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Fey Dragon Scale

NPC	Level	Zone	Chance
Fey Dragon	24 - 25	Stonetalon Mountains	80.0%
Wily Fey Dragon	26 - 27	Stonetalon Mountains	80.0%
Nal'taszar Rare Elite	30	Stonetalon Mountains	80.0%