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
Onyx Boox has the Note Air 3(10in) and the Tab X(13in). They aren’t cheap though, $400 and $900 respectively, mostly because of how expensive those large eInk screens are.
Well an A4 is over 14" diagonally. A 13" might do but 10" doesn’t qualify imo. And yeah the one I saw was stupid expensive.