Have you tried Anderson McQuaid in Cambridge?
http://www.andersonmcquaid.com/
They have a huge selection of wood, I'd be surprised if they didn't carry it. Further north you could try Highland Hardwoods in Brentwood NH.
http://www.highlandhardwoods.com/
They are another lumberyard with an exceptional array of wood available.
I won't even bother to waste time with other yards when I'm looking for something special.
love_2_fish