I was new to 'digital reading' until my iPad. And was quite sad that some of my favourite books were not available to purchase, eg Harry potter!
If you download a free app called 'kobo'
Then google the name of the book you are looking for with 'pdf' after the title,
Then click to open the PDF file in kobo. It makes the PDF file look exactly like a book with animated page turns.
I assume this is legal to do if you actually own a hard copy of the book.
Now I can read Harry potter on my iPad