I recommend a so called universal power adapter like Sima SP-60 that you can get at BestBuy or CircuitCity. (BTW pretty much all laptop power adapters are universal)
It's able to handle ac input 100~240V, 47~63Hz while output DC 3.3V/2.1A, 4.2V/2A, 5V/1.9A, 6.5V/1.7A, 8.4V/1.6A, 9.5V/1.5A through a slide selecting switch. It also comes with a bunch of connectors of different types and sizes to fit your device.
I use it on my reader and it works perfect -- much faster and more reliable than the usb port. Considering price of the adapter is ~$30 and SONY charger costs about the same(if not more), it's pretty easy to make the call.
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