Scrapple is found in mid-Missouri but under a different name. meat shop will recognize "scrapple" and defer you to it. there is a large German presence including Amish and Mennonites so that may be why it's available.
to me, it was a metro Philadelphia breakfast "meat" although i, too, have heard of having it for other meals.
i do not care for scrapple. i think that it was invented as a way to get rid of unwanted guests who show up at your front door. i only get it when i'm in metro Phila.
Smithfield Meats of Virginia makes a scrapple that i've seen both in Michigan and Missouri.
a Chinese concern just took them over so i wonder if this product will continue.