Losing employer insurance, where should I look? (Boston)

My employer coverage ended at the end of the month and I am trying to work out what to do as a customer-service rep. I am in Boston, in case local advice matters. I do not want a gap in coverage. What did you choose and how was the process?

A free navigator at a community health centre walked me through my options. It took an hour and saved me a lot of guessing.