I have just ordered Amazon Kindle EBook Reader. I have looked all the other options. And finally have decided to go with this one.
As far as I know this price is below the limit for customs dues in Bulgaria which is 175 EUR. I will post on this later. Even the bank (UniCredit Bulbank) called me to confirm the payment through my VISA Electron.
You can see the Kindle Wireless Reading Device below together with most of the alternatives available.