"A Canticle for Leibowitz" is available for Kindle in extra large print from
http://ebooks.ebookmall.com/title/ca...ler-ebooks.htm. No DRM. It is easy to convert to html, and change the default font size to normal. It is only $3.95. For a while, some months ago, it was free from a different site, along with some other books, for some kind of promotion.