I have an extra World of Warcraft: Mists of Pandaria Beta Key. I would like to sell it to someone for 1btc.
If you don't find a trade here, you'll probably have better luck on Ogrr, which is a community with a built-in marketplace with feedback and seller ratings:
Here's the U.S WoW forum there, for example:
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https://ogrr.com/forum.php?f=42