Another piece of advice is to purchase the YS 63 online and have it shipped to your hotel room. We do that at least a couple times a week for Int'l travelers. We are out of them and so are lots of other web companies. I say the odds of you finding one in NYC area is going to be low in Hobby Shops in NYC area, dunno about Boston, but I suggest the same.

Oh and if you want to see what NYC looks like before you get here, I just took these pics from top of the Empire State Building a couple weeks ago.

http://dioncini.com/nyc/

Lots to do here ... bring a pocket full of cash, a NYC requirement.