If you can make a goblin, they get a exalted discount with most vendors so that can save some gold. But yeah with Legion mining its ~ 1 ore per node and no leveling besides the quest items which I have not tested if they re-drop or they may say - already completed that quest.
Also the higher the Legion gathering profession you can the more ore could drop as well as reaching Rank 2, adds the chance that Blood of Sargeras can drop from gathering. Blood of Sargeras can be used via the Blood Trader for mats.