I have never read any of Nicola Cornick's romances, but for some reason Amazon thinks I should, and keeps pushing them at me. And right now there are three that are less than $1 each. They look like earlier titles, pubbed by Harlequin, but for these prices, I may try one or two...
Lady Allerton's Wager, $0.10
Kindle US:
https://www.amazon.com/dp/B002C7Z4NW
The Notorious Marriage, $0.50
Kindle US:
https://www.amazon.com/dp/B002C7Z4NM
An Unlikely Suitor, $0.10
Kindle US:
https://www.amazon.com/dp/B002C7Z522
FWIW, Fantastic Fiction says the first two listed are a duopoly...