I work for a boatyard on the Cape and we use New England Propeller in Plymouth a lot. We send them all our outboard/IO props.
Talk to Ron, he knows everything there is to know about props. Nice shop too.
They also fab gorgeous aluminum fuel tanks.
There's also H&H propeller in Salem. Another good shop, been there a few times, but not recently. It's a bit far for us Cape Codders.
Heck, Wareham is too far!