Free. As in, costs you nothing.
EXCEPT YOUR UNDYING LOVE AND A WILLINGNESS TO KILL IN MY NAME.
You can find more information on the download from our Generous Clanking Masters at Angry Robot, whose Beneficent Programming is why this gift exists in the first place.
ALL HAIL THE ANGRY ROBOT.
You can also buy Mockingbird and Blue Blazes for ~$1.30 a pop (info here).
Finally, please consider pre-ordering the third in the Miriam Black series — The Cormorant! — where cantankerous psychic Miriam Black travels down to sunny Florida where she is paid to give a rich man a vision of his demise but instead discovers a message to her written backwards in time and scrawled in blood, a message that reads HELLO, MIRIAM…