These are all repeat freebies, but here are 10 of the 15 titles in the Dead-End Job series by Elaine Viets for free at one time...six in an omnibus (titles 8 - 13) and then also four of the earlier ones.
The titles in the omnibus include:
Killer Cuts,
Half-Price Homicide,
Pumped for Murder,
Final Sail,
Board Stiff, and
Catnapped!
Kindle US:
https://www.amazon.com/gp/product/B087TH216B/
Kindle UK:
https://www.amazon.co.uk/gp/product/B087TH216B/
The four individual titles are:
Shop Til You Drop (#1)
Kindle US:
https://www.amazon.com/gp/product/B083QQCWQZ/
Kindle UK:
https://www.amazon.co.uk/gp/product/B083QQCWQZ/
Just Murdered (#4)
Kindle US:
https://www.amazon.com/gp/product/B079TFZ88P/
Kindle UK:
https://www.amazon.co.uk/gp/product/B079TFZ88P/
Murder Unleashed (#5)
Kindle US:
https://www.amazon.com/gp/product/B079TFX7SS/
Kindle UK:
https://www.amazon.co.uk/gp/product/B079TFX7SS/
Clubbed to Death (#7)
Kindle US:
https://www.amazon.com/gp/product/B079TDZX69/
Kindle UK:
https://www.amazon.co.uk/gp/product/B079TDZX69/