A bunch of price drops to $1.99 at Kindle US,unless otherwise indicated. Mostly, but not all, repeats to me...
Thursday the Rabbi Walked Out, Rabbi Small, #7, by Harry Kemelman
link:
https://www.amazon.com/Thursday-Rabb...dp/B00ZJZIK94/
Murder Out of Turn, Mr. and Mrs. North, #3, by Richard and Frances Lockridge
link:
https://www.amazon.com/Murder-Turn-M...dp/B01AVTU7H0/
The Luck Runs Out, Peter Shandy, #2, by Charlotte MacLeod, $0.99, also at Kobo US (coupon/VIPable)
Kindle US:
https://www.amazon.com/Luck-Runs-Pet...dp/B009S33JYY/
Kobo US:
https://www.kobo.com/us/en/ebook/the-luck-runs-out
The Miss Silver Mysteries: Grey Mask, The Case Is Closed, and Lonesome Road, Miss Silver, # 1 - 3, by Patricia Wentworth, $3.99
link:
https://www.amazon.com/Miss-Silver-M...dp/B01GUO7CK0/
Bethlehem Road, Charlotte and Thomas Pitt, #10, by Anne Perry
link:
https://www.amazon.com/Bethlehem-Roa...dp/B0052ZEI4C/
The Dark Place, Gideon Oliver, #2, by Aaron Elkins
link:
https://www.amazon.com/Dark-Place-Gi...dp/B00J84KRUM/
Maggody and the Moonbeams, Arly Hanks, #13, by Joan Hess
link:
https://www.amazon.com/Maggody-Moonb...dp/B01ENRHK4O/
Murder on the Yellow Brick Road, Toby Peters, #2, by Stuart M. Kaminsky
link:
https://www.amazon.com/Murder-Yellow...dp/B0060OELKU/