They hang out at Half Hilll a bit, due to all the cooking things being done. Other then that its pick your favorite capital pretty much till lvl 87 and Temple of the White Tiger quest line comes open to open the Gates to the Vale of Eternal Blossoms.
Also note that there are ilvl 372@85/ilvl 393@87/ilvl 408@88 Greens Vendors in game to help you out.Every slot is pretty much addressed so no need to grind greens to much on AH or worry about bad drops.
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www.wowhead.com/search?q ··· SuppliesNot in this list is these other two.
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www.wowhead.com/npc=56406And
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www.wowhead.com/npc=62737#sellsAlso if your like me. You will want to twink out your alts with as many ilvl 415 pieces as you can get. These are proc based off of the crafting professions and there green 384 counter parts.