Simon Scarrow's
Day of the Caesars, which is the sixteenth in his excellent IMO Cato/Macro/Eagles of the Empire series, is on sale at Kindle US for $0.99 as part of today's Daily Deal. Somewhat unusually, it's not matched at Kobo, at least as of now. Most of Scarrow's books don't go on sale in the US very often, so I'd grab it if you want it...
Kindle US:
https://www.amazon.com/dp/B01MQI8DOC
Kindle US/Smile:
https://smile.amazon.com/dp/B01MQI8DOC