Been a few of these posted already on ozb but I don't think ever before at this kind of pricing. Originally thought I was being duped but after some googling note that iBuygou has a really good reputation for supplying the real deal so I thought I would post this so it doesn't get buried behind all the other previous deals.
Unsure if it is the 2.0 or 2.1 version but again looking at google people are reporting that ibuygou are selling 2.1s, but as I just ordered these today can't confirm until I receive it :)
Free (untracked) airmail delivery is provided by iBuygou free of charge to major cities, but given it ships from China probably takes like 30 days to get here anyway.
$15.99 USD for the brown/gold originals. At the top of the page there is an option to change the currency to AUD, which gives you $19.44 AUD for these. A seriously good price at the best of times, and a ridiculous price given the crappy exchange rate going ($19.44 is about 82c equivalent which is great as of 11 Feb 2015).
Silver also available (note the cable of the silver one actually appears to be white and the only silver part is the buttons and the actual earphone part). I personally don't like brown but prefer brown to the white cable potentially getting dirty. These are $16.00 USD or $19.45 AUD.
EDIT: To clarify the links:
Silver:
http://www.ibuygou.com/p-new-version-xiaomi-piston-headphone…
Brown/Gold:
http://www.ibuygou.com/p-original-xiaomi-piston-earphone-upd…
Happy buying…
It appears silver has sold out but brown still available. Thanks OP I need a new pair as I water damaged my Sony ones. Just hope the sound quality is passable :)