[ALinkToTao]

Here is what I want from an e-ink ebook reader (in descending order of importance):

1. SD card slot
2. ability to read large pdf documents very well
3. very affordable (I don't mind a used even slightly old device at all as long as it has enough power to read large pdfs)
4. android operating system with very good root support and/or community (eg. easy rooting, ability to remove bloatware, customize and get the most out of a device)
5. this isn't very important at all, but a frontlight that does not lower melatonin (eg. does not have light in the blue color spectrum)

If #5 isn't there, it's not important at all, I'll just use my amber book light instead.

The first 4 things are pretty important to me. If anyone know of an ebook reader like this, please let me know.

I know I can get all this from an android tablet, but I definitely don't want a backlit tablet blasting my eyes with blue light for reading long books on. (for those of you that don't know, blue light lowers brain melatonin and makes sleep not as restorative and deep)

Thank you so very much in advance.