Georgette Heyer’s The Spanish Bride is on sale in the US, at different prices depending on the retailer. This is a little bit different than some of her other books, in that it is based on a real couple, whom Heyer researched in detail, but I liked it a lot. (Of course, I like all of her books…)
Now £0.99 at Kindle UK: https://www.amazon.co.uk/Spanish-Bride-Georgette-Heyer-ebook/dp/B004OEIDCA/