When it comes to an eBook reader, the choices are limited. The market is dominated by Amazon’s proprietary Kindle along with a few other options like Kobo, Nook and Onyx.
An interesting news for open source enthusiasts is that a developer, Joey Castillo, is working on creating an open
The problem is that such open hardware projects can mostly only work with the components on the market, and eInk displays (or advanced displays in general) are principally only sold by their manufacturers to the OEMs they have contracts with. We are lucky to have any eInk display available to us at all for these kinds of endeavours!
This, plus making bigger eink displays with reasonable refresh and antighosting is a pain. They are proportionately more expensive.