The first few titles in Leonardo Padura’s Mario Conde series used to go on sale fairly often. I haven’t noticed them on sale as much recently, but now here is the eighth book in the series, Heretics, on sale in both the US ($1.99) and the UK (£1.99), and it’s discountable at Kobo.
Note that there are a couple of editions of this – one by Farrar/Straus/Giroux and one by Bitter Lemon Press. It’s the Bitter Lemon one that’s on sale, with a yellow cover.
Buy at Kindle US | Kobo US | Kindle UK
Also, the third book in the series, Havana Red, is on sale for $0.99 in the US – and also discountable at Kobo. It’s not on sale, at least as of now, in the UK.
Havana Fever is the sixth in the series. It’s $2.99 right now at Kindle US: https://www.amazon.com/dp/B005DB3JV8
And the third book, Havana Red, has stayed at $0.99 for more than a year now at both Kindle and Kobo US, and is discountable at Kobo US. The links in the OP are still good for that one.