Repair Prices

[Bled]

Iv been meaning to ask this and i apologies if this is off topic and should be posted else ware. Where is the NPC located that sells dark mater? and what are the price stratification for the different grades?

I'm at work, and the little bit of time i get to play during my work week i have been doing quests and leveling ><

Edit: and another question, do you need to be certain crafting job still to repair certain items now with dark matter? and do you need to have that class to a certain rank?