If you are into Royalty books, a lot are on sale currently from HarperCollins especially
The Way We Were: Remembering Diana
By Paul Burrell - 1.99 sale
https://www.amazon.com/dp/B003V1WT36...ercollinsus-20
Kate: The Making of a Princess by Claudia Joseph - 2.99
https://www.amazon.com/dp/B004GUSI04...ercollinsus-20
The Women of Windsor by Catherine Whitney - 1.99
https://www.amazon.com/dp/B000SEGDH2...ercollinsus-20
American Princess by Leslie Carroll - 2.99
https://www.amazon.com/dp/B07869GX5Y...ercollinsus-20
The Battle of the Brothers by Robert Lacey, William and Harry--the Inside Story of a Family in Tumult - 1.99
https://www.amazon.com/dp/B09CQ2NPYB...ercollinsus-20
The Duchess: Camilla Parker Bowles and the Love Affair That Rocked the Crown by Penny Junor 2.99
https://www.amazon.com/dp/B0713VYF5J...ercollinsus-20
The Queen: A Life in Brief by Robert Lacey - 1.99
https://www.amazon.com/dp/B006O422TI...ercollinsus-20