Flash Fiction?

Before today, everything I tried to write came out at 80k words or more. This morning though, I wrote a bit of flash fiction. Now, I’m trying to figure out what to do with it.

So question: would anyone buy a book of many little stories by me? Or should I sell it to a magazine? Or should I include it as a freebie at the end of my next novel? What should I do with my odd little changeling?