The mall was transferred over alongside everything else when we changed up to MoP, but the command was added when we transferred. ... And a lot of people still like using the vendors for browsing and brainstorming, so they get to stay for now. <E>
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(I recommend the MogIt addon, though. Very helpful for set-building without sifting through vendors.)
</E>(I recommend the MogIt addon, though. Very helpful for set-building without sifting through vendors.)