I am in Boston too and came up against the same issue last year.

My income is highly variable and there's not much about that that can change, nor many corners I can cut elsewhere. I ended up changing my weekly therapy to 3 weeks on, 1 week off. I consider myself to be a person who needs weekly therapy currently, but to be honest, the week off has yet to spark a major crisis, and the 3 weeks in a row provide some semblance of continuity. It does suck sometimes, though. I would still do weekly if I could.