If you look at the Products page at
http://www.pocketbook-int.com, you'll see some devices that may suit your needs. The Basic 2 and the Mini have buttons (but near the bottom rather than at the sides), no light and no touch screen.
My PocketBook 902 is many years old now, and the buttons and D-pad are as good they every were.
If you have Amazon MOBI ebooks with the DRM in place, then you won't be able to read them on those devices. It wasn't clear from your post whether you were aware of the problem or not.