Tor has four award-finalist short stories available for free pre-order. One-click now and they will be delivered on June 8, at no cost (at least, in the US; international users may see different prices).
A Memory of Wind, by Rachel Swirsky. This is a Hugo and Locus Award Finalist.
Eros, Philia, Agape, by Rachel Swirsky. This is a Nebula Award Finalist.
First Flight, by Mary Robinette Kowal. This is a Locus Award Finalist.
Overtime, by Charles Stross. This is a Hugo Award Finalist.
Don't have a Kindle? Each of these can be read online at Tor's web site (although I'm not sure if additional editing may have take place before the Kindle editions were published). Keep in mind that sales in the Kindle store, even at zero cost, probably help the author's ratings in the bestseller lists, so be sure to pick up a copy there, as well, if your cost is zero.