Kasey Michaels is offering a free novella prequel in her Redgraves series,
The Wedding Party, for free via Bookfunnel. And the first book in the series,
What an Earl Wants, is on sale for $0.99/£0.99 in the US/UK as well (and discountable at Kobo).
Michaels indicated in her newsletter that she has recently e-pubbed all of the Redgraves series, which came out as paperbacks from HQN in the early 2010s. I looked, and sure enough, the rest of the series (three more books) are all available, at $4.99/£3.99 each. These are Regency historicals.
Bookfunnel link for
The Wedding Party:
https://dl.bookfunnel.com/7k2yp1rhgs
What an Earl Wants
Kindle US:
https://www.amazon.com/dp/B09K1NW55W/
Kobo US:
https://www.kobo.com/us/en/ebook/what-an-earl-wants-8
Kindle UK:
https://www.amazon.co.uk/dp/B09K1NW55W/