I just buy our grocery's store brand, Jones Dairy Farm Braunschweiger. It is NOT primal (nitrites, etc) but for LIVERWURST, I am willing to make an exception. It comes sliced, from a 3" diameter link, sliced about 1/4" thin. One slice, at about .80z, is 60 calories, 45 from fat, 13 from fat, 2 from carb.
If you have your deli measure/look at the label to see how many ounces your big piece is, and just divide it into 1oz portions, you would have about 75 calories.