Deviate Scale
Deviate Scale is found by skinning Deviate Creatures that can only be found in the Northern Barrens and the instance, Wailing Caverns. Deviate creatures level ranges from level 11 to 32. In the Wailing Caverns, to start skinning the creatures, the skinner will need to be at last level 75 to begin skinning.
See below for the map to farm Deviate Scale in WoW.