Was doing Quest - Sunwell Daily - Crystal Ward Credit - Spells - World of Warcraft Sunwell Daily - Crystal Ward Credit, early today and had allready got my 4 Mana Remnants - Items - World of Warcraft Mana Remnants, on the way back to hand in I got attacked by a mob, he dropped another.
So theres nothing stopping you farming these for an hour, then just hand them in each day instead of grinding the mobs everyday.