Another Sara Paretsky/VI Warshawski book on sale, but this time really old backlist (2005).
Fire Sale is the twelfth in the series, and it's $1.99 right now in the US.
Kindle US:
https://www.amazon.com/dp/B000OVLILK
Kobo US:
https://www.kobo.com/us/en/ebook/fire-sale-1