Hi - Fellow New Englander here from RI
Do you have a Passport Health near you? This is where you would go if you needed any vaccines or medications prior to travel (Africa, etc.). My husband recently had to get vaccines for travel to Panama and Africa, and they offered PCR tests for travel with a 30-45 min result time. He did have to pay (I don't remember the cost) but may be worth it if you cannot find any other options.
Good luck!