The 2 books of Teresa Edgerton's Mask and Dagger series are 99p each in Amazon.co.uk Countdown at the moment:
Book 1 Goblin Moon:
https://www.amazon.co.uk/Goblin-Moon...407804&sr=1-31
Book 2 Hobgoblin Night:
https://www.amazon.co.uk/Hobgoblin-N...408406&sr=1-64
Also Peter Morwood's Firebird, Tales of Old Russia Book 2, is a repeat Countdown
https://www.amazon.co.uk/Firebird-Ta...407852&sr=1-47
The Valentine Sale includes Kate Forsyth's The Wild Girl for £1.09:
https://www.amazon.co.uk/Wild-Girl-K...409531&sr=1-82
Also, Bitter Greens:
https://www.amazon.co.uk/Bitter-Gree...409531&sr=1-84