For my Australian counterparts here:
JB HI FI is currently selling Mists for $22 in-store or online ($0.99 shipping).
Cheaper than most sellers I see here and obviously legit.
Might be worth a look if you want MoP cheap for some botting accounts, friends, yourself, etc.
World Of Warcraft: Mists Of Pandaria | Games & Consoles, Platforms, PC Games : JB HI-FI
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Not sure when the sale ends though.