Two Georgette Heyer titles are $1.99 at Kindle and Kobo US right now. A long time ago, Heyer titles used to go on sale annually around the time of her birthday, but I haven't seen that sale in a long time, so grab these if you want them - they are normally $9.99 or more each.
Cotillion
Kindle US:
https://www.amazon.com/dp/B001POX73C
Kindle US/Smile:
https://smile.amazon.com/dp/B001POX73C
Kobo US (discountable):
https://www.kobo.com/us/en/ebook/cotillion-1
Friday's Child
Kindle US:
https://www.amazon.com/dp/B001S49AQW
Kindle US/Smile:
https://smile.amazon.com/dp/B001S49AQW
Kobo US (discountable):
https://www.kobo.com/us/en/ebook/friday-s-child-4