As of now, you can download Engraved on the Eye by Saladin Ahmed for free from Amazon (US, ES). This is the synopsis of the book:
Stories to Captivate the Imagination: Welcome to the worlds of Saladin Ahmed
A medieval physician asked to do the impossible. A gun slinging Muslim wizard in the old West. A disgruntled super villain pining for prison reform. A cybernetic soldier who might or might not be receiving messages from God. Prepare yourself to be transported to new and fantastical worlds.
The short stories in this collection have been nominated for the Nebula and Campbell awards. They’ve been reprinted in The Year’s Best Fantasy and other anthologies, recorded for numerous podcasts, and translated into several foreign languages. Now they are collected in one place for the first time. Experience for yourself the original voice of one of fantasy’s rising stars!