Metatropolis by Jay Lake, Tobias S. Buckell, Elizabeth Bear, John Scalzi, and Karl Schroeder is $2.99 on
Amazon.com
This is a collection of short stories about the fuure of cities, set in a shared universe.
The Barrow Will Send What it May by Margaret Killjoy is $0.99 on
Amazon.com
A novella, sequel to
The Lamb Will Slaughter the Lion
In the first novella, the main character visited an anarchist commune who was having trouble with a spirit they summoned. They decide to continue hunting demons. I don't think you need to read the first novella, but I can recommend it.
Songs of the Dying Earth: Short Stories in Honor of Jack Vance edited by George R. R. Martin and Gardner Dozois is $2.99 on
Amazon.com