My bads. I got caught up on the word "in". As we both know there is virtually nothing that is tax free IN MA.
With the Wayfair decision, you will likely be limited to smaller shops that can fly under the radar of the $1,000,000/200 rule.
If you were inclined to take a drive, there are several place in/near seacoast NH selling Festools. NH is always tax free.