Today with patch 2.0.6 all legendary crafting materials are obsolete and went into grey items, which can be sold for 50,000 gold per piece.
Legendary crafted items are meant to be both a stepping stone into end game items and a good place to spend crafting materials at the end game. While we like the fantasy of having the unique crafting materials, obtaining them was either keeping too many people from being able to complete the recipes in a timely manner or encouraging game flipping and similar less than ideal patterns of play in order to acquire them. As such, we are removing the requirement for unique items when crafting Legendaries.
•Unique crafting materials are no longer required
•Legendary crafting materials will no longer drop
•Existing Legendary crafting materials will now be grey and have had their sell prices increased
•Level 70 crafted sets and Legendary items with unique properties now require additional Death's Breath
•Level 70 crafted Legendary items without unique properties have had their Death's Breath costs removed
•Death's Breath is no longer required for most Artisan training costs
•The Mystic no longer requires any Death's Breath to train
•The Blacksmith and the Jeweler now only require 1 each to learn the first rank of level 11