I find the stories have a much higher hit rate for use in a business context than say Chicken Soup for the Soul.
Mostly I find that reading good non-fiction business books gives the best stories.
Some of the stories I use in Presentation Mastery come from:
You also need to just be on the look out for interesting stories in newspapers, journals, novels, magazines or on TV (I watched Billy Connelly being interviewed once, he had a million great stories).
Remember when buying physical books to use booko.com.au to get the best price worldwide including shipping to Australia (and use the booko link so booko gets paid his few affiliate cents… it’s such a good service!).