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Each of these are $1.99 USD
Not sure if available on Amazon AU for the same price, please feel free to check and post AU links
Science Book
https://www.amazon.com/Science-Book-Ideas-Simply-Explained-e…
History Book
https://www.amazon.com/History-Book-Ideas-Simply-Explained-e…
Psychology Book
https://www.amazon.com/Psychology-Book-Ideas-Simply-Explaine…
Religions Book
https://www.amazon.com/Religions-Book-Ideas-Simply-Explained…
Movie Book
https://www.amazon.com/Movie-Book-Ideas-Simply-Explained-ebo…
AU site only the Politics one is close to this offer $3.99