A Brief History of Time by Stephen Hawking is on sale for $2.99 at most ebook outlets.
Amazon Kindle – https://www.amazon.com/Brief-Hist…B004WY3D
Google Play Books – https://play.google.com/store/boo…hagX6UWOM
Apple iTunes – https://itunes.apple.co
Barnes & Noble Nook – https://www.barnesandno