Hotels are some of the most expensive in the country. I'm not sure what you mean by not too expensive. You can expect to pay anywhere from 200+ a night to 1000. Try one of the sites like expedia. The hotels closest to the Mother Church are the mIdtown which is directly across from The Mot
Amtrak is a fun way to travel! Check out Airbnbs for rates. Boston is tricky to navigate, but if you stayed on the outskirts and had a rental car - or use an Uber or Lift - it ya be more affordable.
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