They do exist, I saw some in Trading post but at very high price.
To use any crafting ingredients you need to have appropriate crafting level, maybe that’s the reason you cannot use some ingredients at the moment.
For example, draconic armor need crafting level 400, also it’s ingredients require that level to be able to use.
You can check the receipts and requirement at http://www.gw2db.com/recipes/armorsmith