Hey i was doing some quests in azshara on my druid and i stumbled upon some mobs named Highborne Apparition and Highborne Lichling they almost 100% drop 1-3 mageweave cloth i killed 12 of them and i got 22mageweave, and on my server they sell for 3g99s a stack might be higher on your server if you are lucky
They are about lvl 45-47 and die pretty fast, there is also a quest on these guys Thottbot World of Warcraft: Quest: Spiritual Unrest
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Sorry if this is a repost or if there is a better place to farm, im just trying to help so dont flame me=)