Fresh Direct has dried bucatini... you can also do a google maps search for the restaurants that serve it and maybe call and ask them if they buy it fresh and if so from where: http://maps.google.com/maps?f=q&s... (Quinto Quarto and Il Riccio are the two manhattan restaurants i see)
I wonder if Buon Italia in Chelsea Market may also have it - I know they have Guanciale (i'm making a carbonara), which is a rare italian bacon-like meat -- so I would check there.
152 East 79th Street, New York, NY 10075
75 9th Ave, New York, NY 10011
14 Bedford St, New York, NY 10014
Guanciale is not all that rare these days. Eataly, Murray's, Salumeria Biellese, Salumeria Rosi, DiPalo's all sell it, too.
254 Bleecker St, New York, NY 10014
Di Palo's Fine Foods
200 Grand St, New York, NY 10013
376 8th Ave, New York, NY 10001
283 Amsterdam Avenue, New York, NY 10023
200 5th Ave, New York, NY 10010
Grace's Marketplace probably has them. http://www.gracesmarketplace.com/
I don't remember Citarella or Agata & Valentina having fresh bucatini. If you're on the UES, you can visit all 3 places mentioned here to make sure.
1313 3rd Ave, New York, NY 10021
Agata & Valentina
1505 1st Ave, New York, NY 10021
1237 3rd Ave, New York, NY 10021