Brad Geagley's two mysteries are $0.99 right now at Kindle US and Kobo US.
Year of the Hyena: A Novel of Murder in Ancient Egypt
Kindle US:
https://www.amazon.com/gp/product/B000FCJZR2/
Kobo US:
https://www.kobo.com/us/en/ebook/year-of-the-hyenas
Day of the False King: A Novel of Murder in Ancient Babylon
Kindle US:
https://www.amazon.com/gp/product/B000FCKROC/
Kobo US:
https://www.kobo.com/us/en/ebook/day-of-the-false-king