I'm not entirely sure the Kindle was the best choice for this project, actually. Something that has support for a lending-library program (Sony?) might have been a better option, maybe a bunch of the cheaper Pocket editions.
Also, I'm surprised they haven't figured out they can go far beyond what's in the Amazon store. There's a ton of public domain books they can easily load onto the Kindles, they don't quite seem aware of it.
And I still think dropping $12k on the espresso machine was a mistake.