These are some good resouces for books online.

https://www.storylineonline.net/

https://www.uniteforliteracy.com/

https://www.ryanandcraig.com/

  https://www.getepic.com/

https://bookflix.digital.scholastic.com/

https://sdm-tfx.digital.scholastic.com/

http://www.professorgarfield.org/toon_book_reader/index.html