Just to be clear Sunday Shorts is simply about finding new short stories be they ones you’ve read and want to share with others or ones you ie. me have heard about and think sound great and want to read sometime down the road.
I’ve found that authors web sites are a great place for short stories. They will post a couple for people to enjoy that way you can sample their work. Another place I’ve found for short stories is online magazines. There are many out there such as Apex Magazine.
From the latest issue number 40 is a story called Sacrifice by Jennifer Pelland