The Cecelia and Kate Novels (Sorcery & Cecelia, The Grand Tour, and The Mislaid Magician) by Patricia C. Wrede & Caroline Stevermer is currently $1.99 for the set in the US.
This is a really great deal, they are written in the form of letters between the characters so the style is somewhat different but if you enjoy regency mixed with magic and don't mind young characters then it's worth picking up. I enjoyed it although I thought the first book was the best
https://www.kobo.com/us/en/ebook/the...nd-kate-novels
https://www.amazon.com/Cecelia-Kate-.../dp/B00NVZPCUE
A trio of bewitching novels featuring devoted cousins who must juggle their magical powers with their duties as ladies in Regency-era England.
Enter Regency-era England—and a world in which magical mayhem and high society go hand in hand—with three novels featuring cousins Cecelia and Kate.
The Mists of Avalon by Marion Zimmer Bradley is also on sale for $1.99 in the US at amazon. I haven't read this but have read and enjoyed some other novels of the author
https://www.amazon.com/Mists-Avalon-.../dp/B000FC1JCQ