A couple of Agatha Christie classics, and a couple of others I noticed in the Load up your Kindle for 2019 (US) sale, ending 12/30/2018.
And Then There Were None, apa the now pretty unacceptable title,
Ten Little Indians, also originally pub as a now really unacceptable title that I won't list, $2.99
Kindle US:
https://www.amazon.com/Then-There-We...dp/B000FC1RCI/
Death on the Nile, $2.99
Kindle US:
https://www.amazon.com/Death-Nile-He...dp/B000FCK9D6/
Wedding Cake Murder, Hannah Swensen #19, by Joanne Fluke, $2.99
Kindle US:
https://www.amazon.com/Wedding-Cake-...dp/B00Y6RB46W/
an omnibus of the first three titles in the John Corey series by Nelson DeMille, [I]The John Corey Collection: Plum Island, The Lion's Game, and Night Fall[/], $6.99, which is a pretty good price if you need all three
Kindle US:
https://www.amazon.com/John-Corey-Co...dp/B009YMIMQE/
also matched at Kobo US:
https://www.kobo.com/us/en/ebook/the...rey-collection