Several titles in Margaret Maron's also excellent IMO Deborah Knott series and one title in her Sigrid Harald series are $1.99 right now at Kindle and Kobo US. Some are older/semi-perm price drops, and I'm just relisting, but some are recent.
Winter’s Child, Deborah Knott #12
Kindle US:
https://www.amazon.com/dp/B000QRIH0M
Kobo US:
https://www.kobo.com/us/en/ebook/winter-s-child-1
Hard Row, Deborah Knott #13
Kindle US:
https://www.amazon.com/dp/B000QRIH0W
Kobo US:
https://www.kobo.com/us/en/ebook/hard-row
Death’s Half Acre, Deborah Knott #14
Kindle US:
https://www.amazon.com/dp/B00125L86W
Kobo US:
https://www.kobo.com/us/en/ebook/death-s-half-acre-1
Sand Sharks, Deborah Knott #15
Kindle US:
https://www.amazon.com/dp/B002J05IOM
Kobo US:
https://www.kobo.com/us/en/ebook/sand-sharks
Three-Day Town, Deborah Knott #17
Kindle US:
https://www.amazon.com/dp/B004QZ9PAQ
Kobo US:
https://www.kobo.com/us/en/ebook/three-day-town
Designated Daughters, Deborah Knott #19
Kindle US:
https://www.amazon.com/dp/B00H25FJ66
Kobo US:
https://www.kobo.com/us/en/ebook/designated-daughters
Take Out, Sigrid Harald #9
Kindle US:
https://www.amazon.com/dp/B01M0CIDDK
Kobo US:
https://www.kobo.com/us/en/ebook/take-out-3