Not exactly an ebook device, but somewhat related. Something I've been wondering about for a long time....

http://blog.scifi.com/tech/archives/2006/12/20/booksondemand_m.html

I thought I had seen one about a year or two ago that they claimed was going to be in the $10,000-20,000 range with a library of books behind it. But it was too complicated for customers to use. You had to have trained book producers at a store.

This one seems to be $50,000 per Engadget's article (http://www.engadget.com/2006/12/21/the-espresso-from-on-demand-books-brews-you-up-a-copy-right-fres/), but is supposed to end up in the NY Public Library in Feb, and can do two books in 7 mins. Pretty impressive!