How Long 'til Black Future Month? by N.K. Jemisin, a collection of short fiction from the 3-time best novel Hugo winner, is $4.99 at US stores. This just came out about a month ago.
Amazon US
Kobo US
I haven't read this yet, but I've enjoyed her books and previous stories. And one of the stories from this collection is also going to be included in Jonathan Strahan's Year's Best anthology.