Cheap at $3, but it looks like the real (OEM) thing.
Made in China by Foxlink according to the silk-screen.
It looks high quality inside, and certainly not simple.
Works well with my old car-charger.

It is a buck-boost DC converter. Will raise or lower the voltage as needed. From a single 18650 Li-Ion cell, it drew 1.6A charging the phone in a brief test.

I wonder if the missing adapters are related to reports on the web of the device overheating and a hole melting in it.
http://www.nokiausers.net/General/N9...a-Charger.html