In the past, I've typically used an anthology of fiction for my advanced writing class, along with a craft book. This time around, I think I want to try something different -- for half the semester, I'll provide stories I think are just great, and for the second half, I'm going to ask the students to bring in and present stories they think are just great (keeping the focus on craft).
To that end, I'm casting the net open for suggestions -- if you could recommend an excellent story to an advanced fiction writing class, what would it be? These are mostly English majors who will likely have read most of the famous short story writers -- Hemingway, Munro, Salinger, etc. So I'm looking more for things they might not have heard of, but which you will passionately defend as fabulous. Genre stuff is welcome!
And, to make this more challenging for you (but much easier for my students), the story should either be available free online, or cost no more than $1.99 to download in a widely-available format, such as PDF. Nothing that requires owning a Kindle, for example.
If you feel like also telling me why you like that piece, even better. :-)
-- update: thanks for all the suggestions -- will read today, compile a list, and post!