A big chunk of Jodi Taylor's Chronicles of St. Mary's series has recently dropped in price at Kindle UK - mostly from £4.99 to £2.99. And there have been some price drops in the US too (to $2.99), but not as many. In any case, there are too many titles for me to list, but below are links to the series webpages. And a few are also on sale at Kobo US, and presumably at Kobo UK, although I don't tend to check there. So if you have a hole or two to fill in...
Kindle US:
https://www.amazon.com/dp/B09CT3DQLK...kindle_edition
Kindle UK:
https://www.amazon.co.uk/dp/B09CT3DQ...kindle_edition
Kobo US:
https://www.kobo.com/us/en/series/ch...s-of-st-mary-s