Banh mi shops are nearly non-existent in the Northeast (especially in Vermont). The only one that I have come across was from an Asian grocery store - the sandwiches were soggy, bland, and stale. But, when you're ethnically isolated and craving a good Vietnamese sandwich, you don't have a choice.
Hoang Oanh is the closest place I've tried that makes an authentic banh mi. Sandwiches are only $2.75, but they are very cheap on their ingredients. Portions of both meat and pickled vegetables are lacking. It doesn't seem like they carry the freshest baguettes either, but at least they were not stale. I savored that familiar pate flavor with every bite. It will probably be a while before I come across another sandwich.