A bunch of Reginald Hill titles have recently dropped to $2.99 at Kindle US and Kobo US (where they are coupon/VIPable). Mostly Dalziel/Pascoe, but some others too.
Deadheads, Dalziel/Pascoe #7
Kindle US:
https://www.amazon.com/gp/product/B07P2CNLLX/
Kobo US:
https://www.kobo.com/us/en/ebook/deadheads-5
Exit Lines, Dalziel/Pascoe#8
Kindle US:
https://www.amazon.com/gp/product/B07P4LGHMJ/
Kobo US:
https://www.kobo.com/us/en/ebook/exit-lines-3
Underworld, Dalziel/Pascoe #10
Kindle US:
https://www.amazon.com/gp/product/B07P2FRFCD/
Kobo US:
https://www.kobo.com/us/en/ebook/underworld-40
Pictures of Perfection, Dalziel/Pascoe #14
Kindle US:
https://www.amazon.com/gp/product/B07P3HNC8H/
Kobo US:
https://www.kobo.com/us/en/ebook/pictures-of-perfection
Asking for the Moon: four Dalziel/Pascoe short stories
Kindle US:
https://www.amazon.com/gp/product/B07WSSZH5H/
Kobo US:
https://www.kobo.com/us/en/ebook/asking-for-the-moon-1
Blood Sympathy, Joe Sixsmith #1
Kindle US:
https://www.amazon.com/gp/product/B07WRNR7P4/
Kobo US:
https://www.kobo.com/us/en/ebook/blood-sympathy
Born Guilty, Joe Sixsmith #2
Kindle US:
https://www.amazon.com/gp/product/B07WVVXM44/
Kobo US:
https://www.kobo.com/us/en/ebook/born-guilty-1
The Roar of the Butterflies, Joe Sixsmith #5, has been $1.99 since early July, not coupon/VIPable at Kobo
Kindle US:
https://www.amazon.com/gp/product/B0015DTVVA/
Kobo US:
https://www.kobo.com/us/en/ebook/the...he-butterflies
Death of a Dormouse, non-series
Kindle US:
https://www.amazon.com/gp/product/B07PWMY5RX/
Kobo US:
https://www.kobo.com/us/en/ebook/death-of-a-dormouse-1