Thick Leather

Source
This item can be purchased for from  in Terokkar Forest,Mulgore, and Elwynn Forest whenever the Darkmoon Faire is in the zone.

This item is a quest reward from.

This item can be obtained through the Skinning profession on level 40-50 mobs. Reliable sources include:

The Sprite Darters in the area of the Grimtotem Compound in Feralas have almost a 100% drop rate for Thick Leather.
 * Lvl. 48+: Southeast to east of Un'Goro Crater. The raptors range from levels 48-51.
 * Lvl. 49-50: Along the eastern shore in The Hinterlands are turtles from level 44-46. They drop thick leather roughly 60% of the time and rugged leather roughly 40% of the time. Be wary of Gammerita, however, an aggressive turtle who will attack on sight. Read a full writeup on the Hinterland turtles here.
 * Lvl. 50-51: Giant Ember Worg and the Dragonkin surrounding the Eastern and Northern sides of Dreadmaul Rock drop both Thick and rugged at a 60/40% rate. (Cata)
 * Lvl. 50-51/60-61: Unbeknowest to most players the Alterac Rams and Frostwolf Howlers in Alterac Valley are skinnable once killed and looted. Most of the time they will drop Thick Leather.

Thick Leather as a quest objective
This item is an objective for the following quests:

As an Ingredient
Thick Leather is used in the following recipes:

Blacksmithing

 * Blight
 * Blight