pine64 has pinenote using rockchip RK 3566
$399
Here is competitor that is $150
InkPalm Plus eReader
Xiaomi Moaan InkPalm Plus runs Android 11 with support for the installation of third-party apps, and ships with a USB-C cable for charging and a user manual. It’s only available in China right now, but like the earlier InkPalm 5, it should become available on Aliexpress and other Chinese resellers in a few weeks or months. The language is likely to be set to Chinese by default, but it may be possible to change the language to English through an adb command.
Note that e-readers can sometimes be converted to linux
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