Daggerspell by Katharine Kerr (Deverry #1) is on sale for $1.99 in the US
https://www.kobo.com/us/en/ebook/daggerspell
Deathwish by Rob Thurman (Cal Leandros #4) is currently $1.99 in the US
and book 1 Nightlife is available for $2.99
https://www.kobo.com/us/en/ebook/nightlife-2
https://www.kobo.com/us/en/ebook/deathwish-1
Uprooted by Naomi Novik is on sale for $2.99
https://www.kobo.com/us/en/ebook/uprooted-9