Ouch-- not getting to make a B&H run is a bummer. Disneyland for photographers.
The only two places that won't be closed for the holidays that carry serious darkroom stuff that I can think of would be Calumet ( www.calumetphoto.com) and K&M ( http://www.kmcamera.com/ ) . The latter is kind of an odd place (lousy web site), it might be worth a call or visit to see if they have any.
Or you could always post a "WTB" in the NYC Craigslist -- probably worth a shot.
Enjoy your visit-- it's a beautiful time of year here.