An omnibus containing books 6 - 10 of the Josie Marcus Mystery Shopper series by Elaine Viets is free right now at Kindle US and UK. The titles are:
An Uplifting Murder,
Death on a Platter,
Murder Is a Piece of Cake,
Fixing to Die, and
A Dog Gone Murder.
Kindle US:
https://www.amazon.com/dp/B09HN9W6FG
Kindle UK:
https://www.amazon.co.uk/dp/B09HN9W6FG
Also, if you missed the free omnibus of books 1 - 5 earlier,
The Fashion Hound Murders, which is the fifth title, is free individually right now as well. Info and links in
this previous post.