Where can I buy an 'AC wall adapter, or "duckhead" (US)'?
I have found duckheads on amazon, but I'm not sure how to make sure they are certified by apple.
MacBook Pro (13-inch Early 2011), OS X Yosemite (10.10.5)
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Apple does not sell those parts separately, so the vendor's source will remain a mystery.
They're probably OK to use.
It's counterfeit power adapters that can be dangerous due to inferior internal components or designs that would not meet consumer product safety requirements. It's difficult or impossible to determine from an exterior inspection whether one is genuine or not.