I don't know if this counts as a bargain, but it's under 5 (3.99). John Levitt (I'm a big fan of his urban fantasy series, Dog Days) is publishing his thriller backlist (finally). They are regular mysteries/thrillers (no fantasy elements). I have them both in hardback from way back when.
https://www.amazon.com/Ten-Swords-Jo...=ten+of+swords
I don't know when Carnivores will be out. I assume soon. He wrote these before writing the dog days series.