Inspired by a postcard-length short story by science fiction master Arthur C. Clarke, Postcard Shorts accepts stories that are, well, postcard length.

(That translates to about 250 words)

Pretty much anything goes, as long as it’s not completely devoid of merit (in the Editor’s opinion). The Editor’s decision is final.

The copyright for anything you submit is wholly yours. You own it. This site just displays your work.
– from Postcardshorts.com

This is not a paying market but it is bite-sized and very tempting.