You can go to yahoo answers and ask this question, there are a few links there they are good.
Where Can I Read My Sister's Keeper Online For Free?
Ii really don't know, but I have the book and it's great so I think you should really get the book instead of reading it online. I don't know it's just to me reading the book in my hand is better than reading it online.
I don't know about online but I seen my sister keeper at mejers plus I watch the movie and its sad but not that bad