A Sound of Thunder & Other Stories

This is a wonderful selection of Bradbury’s greatest short stories.  If you ever wanted to just buy the one book (though I personally would not be able to stop at just one book!) this would be a good contender because it has a broad spectrum of his many years of storytelling, covering his many periods or phases of literature.
While I began with The Martian Chronicles, and progressed from there to the rest of his space themed collections…and everything else he has ever written, this book would be a really good introduction for the novice Bradbury reader.