I picked up a 16-oz can for $2.99 at a local supermarket. You can also find it on Amazon in bulk. Interestingly, I found it with the canned beans as B&M's traditional business seems to be canned beans.
The bread is actually steamed right in the can (you can tell as the top side has a risen dome, while the bottom retains an imprint of the can's lid. You actually have to remove both ends of the can and push it out.
Nutritional Info - B&M Brown Bread in a Can with Raisins
Serving Size - 2 oz (56g / 1/2-inch slice)
Calories - 130 (from Fat - 5)
Fat - .5g (Saturated Fat - 0g)
Sodium - 380mg
Carbs - 29g (Sugar - 16g)
Protein - 3g