I've been there once before, and it's pretty good, with a few items. Though...I was a bit surprised, b/c it's not strictly "American" as I thought it might be, but as the name says
Canadian. So they had reece's pieces, baked potato thins, maple syrup and Aunt Jemima pancake mix, kool aid and cherry nibs - but was very small, and that was about all I could find. There is also another small store, a few paces down from the Canada one that sold N. Zealand/S. Africa foodages.
I've been much more impressed with Selfridges, to be honest.
~Christa