I never really thought about it, but Trader Joe’s doesn’t advertise. The closest they get is the occasional Fantastic Flyer they send in the mail if you joined their list.
An enterprising fellow with a Palm Treo remedied this deficiency by creating a Trader Joe’s commercial from footage shot on his Palm Treo. It’s very clever, but the song he wrote to accompany it is amazing.
… and they’ve been out of frozen Tarte d’Alsace for months.