Several books in Shirley Rousseau Murphy's Joe Grey and Dulcie series are on sale right now in the US and UK. $1.99 in the US, £1.59 at Kindle UK unless otherwise indicated, and £1.99 (but discountable) at Kobo UK.
Cat Spitting Mad, #6
Kindle US:
https://www.amazon.com/dp/B000W914OK
Kobo US:
https://www.kobo.com/us/en/ebook/cat-spitting-mad-5
Kindle UK:
https://www.amazon.co.uk/dp/B000W914OK
Kobo UK:
https://www.kobo.com/gb/en/ebook/cat-spitting-mad-5
Cat Laughing Last, #7
Kindle US:
https://www.amazon.com/dp/B000W916G6
Kobo US:
https://www.kobo.com/us/en/ebook/cat-laughing-last-5
Kindle UK:
https://www.amazon.co.uk/dp/B000W916G6
Kobo UK:
https://www.kobo.com/gb/en/ebook/cat-laughing-last-5
Cat Seeing Double, #8
Kindle US:
https://www.amazon.com/dp/B000W9654Y
Kobo US:
https://www.kobo.com/us/en/ebook/cat-seeing-double-5
Kindle UK:
https://www.amazon.co.uk/dp/B000W9654Y
Kobo UK:
https://www.kobo.com/gb/en/ebook/cat-seeing-double-5
Cat Fear No Evil, #9
Kindle US:
https://www.amazon.com/dp/B000W9666G
Kobo US:
https://www.kobo.com/us/en/ebook/cat-fear-no-evil-5
Kindle UK:
https://www.amazon.co.uk/dp/B000W9666G
Kobo UK:
https://www.kobo.com/gb/en/ebook/cat-fear-no-evil-5
Cat Deck the Halls, #13
Kindle US:
https://www.amazon.com/dp/B000W916DO
Kobo US:
https://www.kobo.com/us/en/ebook/cat-deck-the-halls
Cat Bearing Gifts, #18
Kindle US:
https://www.amazon.com/dp/B007HBGMJI
Kobo US:
https://www.kobo.com/us/en/ebook/cat-bearing-gifts-4
Kindle UK, £1.99:
https://www.amazon.co.uk/dp/B007HBGMJI
Kobo UK:
https://www.kobo.com/gb/en/ebook/cat-bearing-gifts-4
Cat Chase the Moon, #21
Kindle US:
https://www.amazon.com/dp/B074SJFG7D
Kobo US:
https://www.kobo.com/us/en/ebook/cat-chase-the-moon
And, yeah, I should have just done webpage links, but I got started and then just kept noticing more, so here they all are individually. I clearly never heard of the sunk cost fallacy
.