Bradbury's work has appeared in almost all media. One of the oddest items, though, is a short story which appeared in a magazine with an advertisement attached. "The Hour of Ghosts" was first published in Saturday Review on October 25 1969, and has not yet been collected in any of Bradbury's books, although it was anthologised in Peter Haining's Ghost Tour in 1991.
In December 1969, the story was reprinted in Playboy - as a centrefold, no less! This time, the story appeared with an advertising strapline:
In the science fiction of today lie the bits and pieces of tomorrow's reality. A reality that all of us in the Bell system are planning for today. Bell AT&T.
This version of the story can be viewed on Flickr, thanks to Sizemore who uploaded it: part one here, part two here.