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Get the free downloads from The Hugo Awards nominees.
Get the free downloads from Nebula Award Nominees.
With both, you'll have to use Right Click and Save As to get them downloaded, as just clicking the link often displays an error (looks like a coding error at their end, as the browser thinks it is opening a directory, rather than downloading a file). I generally buy this and Analog SF magazine at Fictionwise, but both are also available on the Kindle.
If you are interested in getting a copy of all the Hugo Award nominee's works, you can still join Chicon as a supporting member (it costs $50/year) and get copies of the nominated novels, novellas, novelettes and many "related works" as seen on this page (scroll about half way down). Of course, you are expected to then read them and vote by July 31st (done online), in at least one category, if not all of them.