This is literally what happens on Halloween in every city in America for at least the last 30 years (aka my entire life), and probably longer….

This is the actual correct answer for OP in taking his price range into consideration. A surrounding burb on a bus line directly into downtown.

They have bagels, and then they also have gluten free options… like yogurt

Olmo bagelry.

There’s also that new kosher bakery Ricotta but i haven’t tried their bagels.