Food / Polish Duck Soup [117]

I an 70 years old now, and I was smart enough to write down my Mother's recipe for duck soup while she was making it. I can find ducks in the grocery stores, but not the blood. I live in a suburb of Chicago. I probably could find a Polish store in Chicago, but I'm not sure. I grew up on that soup and I love it. Does anyone know where I can get duck's blood in the Chicago area? Or southern suburbs?