Desperately Seeking Sausage Suppliers - Cotechino Sausage Suppliers!
Found this on a Jamie Oliver site.
Cotechino or zampone sausage is the big hero in this dish. You should be able to buy these, or order them at least, from any good Italian deli (and if they can't get them for you then they're not a good Italian deli). They come already cooked in a vacuum-sealed bag.