Hya Sepino:
The one I bought -- recommended for Sony readers -- is the 'universal charger' at $24.95 by Gomadic on this page:
http://www.gomadic.com/brand-gomadic...cessories.html
You'll find it comes with a range of simple adapters that will fit any mains plug in Europe, US, UK and elsewhere (handy for travel). It's neat, easy to use and very, very fast.
A word of warning if you order this: Be very careful when you open the package it comes in. There's a tiny part, in a separate plastic envelope an inch or so square, that can be very easily overlooked. This is the 'tip-exchange' that you need to adapt the charger to the reader.
Gomadic is pretty efficient, by the way. My package arrived in a record four days of placing the order online. Great customer service, too (which is why I know about that tiny little part ... like a twit, I didn't notice it before I threw away the wraping and they had to rush me another one [gratis]).
Good luck. Neil