A relatively new (January, 2021) compilation of the first five titles in the Constable Nick series by Nicholas Rhea (pen name for Peter Walker) is $0.99/£0.99 at Kindle US/UK right now. If you don’t have any/many of these, this might be a great deal. This is a very slow paced and cozy series, so be forewarned.
The titles are:
Constable on the Hill
Constable on the Prowl
Constable Around the Village
Constable Across the Moors
Constable in the Dale
If you missed the omnibus deal up above, now the first book in this series, Constable on the Hill, is free individually at Kindle US and UK, but sadly not at Kobo – at least as of now.
Kindle US: https://www.amazon.com/dp/B085F2SPR8
Kindle UK: https://www.amazon.co.uk/dp/B085F2SPR8