Miss Silver titles by Patricia Wentworth go on sale quite often so these are probably all repeats, but there are sixteen of them at $0.99 each today, if I counted right, and one at $1.99.
Link is to the series page (you might have to click at the bottom to get the entire list) because it was easier than copying all the separate urls.
https://www.amazon.com/dp/B07BTPW3JW...eries_rwt_tkin