One funny side of this is that a fair number of Trader Joe's "house brand" items have been available as "President's Choice" or "Black Label" in Canadian Loblaws stores - often both made/imported by SunFresh of Mississauga and then rebranded.

(Note: I caught onto this several years ago and haven't been to a TJ in a while - it's entirely possible TJ's and Loblaws have changed their suppliers since.)