I was talking with Cyndi the Fish Lady at the Brookline farmer's market last week and she said she's in negotiations to set up a year-round presence in the Coolidge Corner area. She couldn't say exactly where yet as the deal is not done.
It would not be her own place, but a temporary (once a week?) stand in an existing store of some kind, so that she can continue her business after the market season ends. Fingers crossed that this comes through!