The three titles in the The Fall of the Gas-Lit Empire series by Rod Duncan have dropped to $1.99/$2.99 at Kindle and Kobo US. I debated a little while about where to list these - Kindle puts them in mystery, but the descriptions feel more like fantasy/alternate history, the blurbs say to list them under fantasy, and SYKM doesn't list this series, although they do list some of Duncan's other titles. Oh, and the first one says it was a finalist for the Philip K Dick award, and not for the Edgar, Agatha, or Anthony,

so I went for putting them here and will put a cross-post in the mystery thread.
The Bullet-Catcher's Daughter, #1, $1.99
Kindle US:
https://www.amazon.com/Bullet-Catche...dp/B00IQQUYTW/
Kobo US:
https://www.kobo.com/us/en/ebook/the...her-s-daughter
Unseemly Science, #2, $1.99
Kindle US:
https://www.amazon.com/Unseemly-Scie...dp/B00MDHLPDE/
Kobo US:
https://www.kobo.com/us/en/ebook/unseemly-science
The Custodian of Marvels, #3, $2.99
Kindle US:
https://www.amazon.com/Custodian-Mar...dp/B00X2E2MAC/
Kobo US:
https://www.kobo.com/us/en/ebook/the...ian-of-marvels