[North19]

My eight-year-old son is a great reader-except that he has visual issues. He struggles with visual tracking and fatigue when reading. What I'm hoping for as features

* adjustable font size --esp making the text thick, not just bigger
* he can switch the background to black with white text (It may be other color combos would work too, but black words on white/e-ink screen is not ideal for him.)
* lots of kids' book selections available, especially library options
* as affordable as possible.
* reading fluency apps would be a big plus as well (though I know pricier). (NOT learn-to-read literacy apps: he can read individual words or short lines of big fat text at a sixth grade level or so, but he can't move his eyes across normal text well.)

If nothing under that $125 is worth buying, we can wait and save, but we'd be more motivated if we knew what made it worth the effort.

We're also willing to look at projector options, as we own a zillion kids' physical books, but haven't found anything that could take regular books and project them large onto a wall affordably.

Any tips from anyone on other ways to make reading easier for him are welcome too.

Thanks in advance.