The basic Kindle (not the Paperwhite) is a cheap option. I think it comes with a bold font built in which may be good enough for you (I think it's called Ember), but the font choices are a lot more limited than a Kobo. Also you can hack a Kobo to have white text on a black background, which might help you.
You could also look on shopgoodwill (USA only) if you don't mind used. But no Kobo's there. An old Nook Simple Touch might suit you.
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