I live in Ohio and we call it Dutch Loaf but I've also heard it called Old Fashioned Loaf. And its soooo not even close to SPAM. Its way tastier and doesn't come in a can. You can get it in about any grocery store deli around here. I used to work at a deli, and yes it comes in a big loaf that the deli slices for sandwiches. I can't remember what brand we used. I do know that its usually made from pork and beef with spices and is smoked over some type of hardwood. I found a few pictures if that helps. Good luck with your search!
http://www.recipetips.com/glossary-term/t--37403/dutch-loaf-luncheon-meat.asp
http://www.koegelmeats.com/products/d...