A bunch of random price drops at Kindle US...
I'm traveling for work, and don't have time for blurbs or Kobo price checks, but most of these are major publishers, and should be on sale at Kobo too.
Death of an Old Sinner, Mrs. Norris #1, by Dorothy Salisbury Davis, $1.99:
https://www.amazon.com/dp/B00HWKHS2E
Terra Incognita, Gaius Petreius Ruso (and Tilla) #2, by Ruth Downie, $1.99, I really like this series:
https://www.amazon.com/dp/B003Z6QLEA
Bertie and the Tinman, Bertie (Albert Edward, Prince of Wales) #1, by Peter Lovesey, $1.99 as a pre-order although other editions have been available elsewhere, I like this series too:
https://www.amazon.com/dp/B07DT124KC
Royal Flush, Lady Georgie #3, by Rhys Bowen, $1.99, another really fun cozy series IMO:
https://www.amazon.com/dp/B002DGKVQ2
Thrice the Brinded Cat Hath Mew'd, Flavia de Luce #8, by Alan Bradley, 2.99, another great series IMO:
https://www.amazon.com/dp/B01BAU2KSI
The Cat Who Knew Shakespeare, Cat Who... #7, by Lilian Jackson Braun, $1.99:
https://www.amazon.com/dp/B01BS7N7IA
The Frangipani Tree Mystery, SuLin #1, by Ovidia Yu, $3.99 (a bit much usually for me to post, but I really like this author/series):
https://www.amazon.com/dp/B075WRF64F