Ray Bradbury wrote an unknown number of stories, but over 400. Some say 600. Doesn’t matter. Back in 1980, Knopf published 100 of these stories, chosen by Bradbury himself to represent the rest. The Stories of Ray Bradbury is over 900 print pages. The stories date from 1943 to 1980. And now, for a presumably limited time and probably just in the United States, you can get this book* in futuristic electronic Kindle form for three bucks.
It is worth noting that a second book, “Bradbury Stories: 100 of His Most Celebrated Tales“, was produced in 2003, and includes another 100 stories, with no overlap between the two books. As far as I know that book is not on sale at this time.