Nowhere. Once you sell your book, the publisher will find you an illustrator and pay them. Nobody works for free.
The best place is librivox.org. They have over 3000 free audio books recorded by volunteers. All the audio books are in the public domain so they're all completely free to you me an everyone. You can...
You can go to army search but you have to sign in.
type in the kindle store free ebooks it is a lifesaver
Robert Walton was writing the letters to his sister Mrs. Margaret Saville