The following may be of interest (with apologies to those already in the know).
In putting together the next “New Month Old Post” post for Thursday, I
came across a resource called Fadedpage ( https://www.fadedpage.com/ )
which contains a growing number (currently 5659) of free, high-quality,
public domain (in Canada) ebooks in PDF, Epub, Mobi (Kindle) and other
formats.
For example (from a fairly random look through), it has Ian Fleming’s James Bond books, novels by C. S. Lewis, Nevil Shute and Evelyn Waugh, Winston Churchill’s Second World War series, books by Albert Camus in French, lots by George Orwell such as Homage to Catalonia and The Road to Wigan Pier, the Biggles stories of W. E. Johns’s and seemingly everything by Enid Blyton (or if you prefer the American equivalent, books from the Stratemeyer series including a couple of Laura Lee Hope’s Bobbsey Twins stories which I enjoyed at Junior School). Too many to mention, really.
Many, of course, are also available from the Kindle store, but often at a cost, and I tend to find that the digitisation of free Kindle books is of variable quality.