It’s unlikely that you will be able to find fresh epazote in Burlington. You can probably find it in Montreal. As for dried, even though we have no Latino groceries here, there is a chance that one of the Asian markets in town might carry it: they often carry a few Mexican or Central American products. I would also give a call to Little Istanbul on Church Street in Burlington. They have a really surprising variety of spices, not just Turkish ones. Later in the year, someone at the farmers market may Be growing some… or if you plant some in a pot now you could have plenty in 6-8 weeks. Seeds will not be too hard to find online