I've noticed N618 is already available on Chinese ebay-like website:
www.taobao.com with the price around 3280 RMB (470 USD). You can get ebooks from Hanvon's official website
http://www.hwebook.com.cn, but the amounts of ebooks on it is very limited, only 10,000 including 3,000 free ones.
That's all I know.