Georgette Heyer's Classic Heroines is an omnibus containing
Cotillion,
Faro's Daughter, and
Friday's Child. Not quite sure what makes these three "classic". I actually think most of Heyer's books are classic, but probably wouldn't pick these three for the designation specifically.
But in any case, the omnibus is on sale right now for $3.99 in the US and it's discountable at Kobo US. So if you need/want all three, this isn't a bad price for the lot, especially at Kobo!
Kindle US:
https://www.amazon.com/dp/B083QMJY23
Kobo US:
https://www.kobo.com/us/en/ebook/geo...assic-heroines