Have read all the novels and loved them all. I bought a copy of Rocky Wood's Stephen King Uncollected and Unpublished. That started me on a massive scavenger hunt. There were (are) many short stories and poems that I had not read or seen before. It has been fun trying to gather some of these.
My two favorites are "Before the Play" published in Whispers and the original publication of Children of the Corn in Penthouse 1977.