http://www.insectsofalberta.com/germancockroach.htm
Apparently the german cockroach is the most prolific in Alberta.
I saw one at southcentre mall a few years back and it looked nothing like the one in the link. At the time I had no idea what it was. Other people also stopped to look and had no idea what it was. The one I saw was flat and green. and it was maybe 4 cm long. I would assume different types come from different parts of the world in food shipments.