This may not be new news, but I just noticed there are a bunch of "tor.com originals" for 0.99 and some for 2.99 on amazon.com.
ETA - The $0.99 ones appear to be short stories.
https://www.amazon.com/s/ref=nb_sb_n...r.com+original
These two look interesting....
A Human Stain ($0.99)
Amazon.com -
https://www.amazon.com/Human-Stain-T...qid=1486074693
Good Reads -
https://www.goodreads.com/book/show/...-a-human-stain
River of Teeth ($2.99)
Amazon.com -
https://www.amazon.com/River-Teeth-S...qid=1486074136
Good Reads -
https://www.goodreads.com/book/show/...river-of-teeth