I'm taking a break from pies to make christmas cookies. I have pastry bags, I have food coloring gel but the one thing I always have trouble finding is a fine enough piping tip for making a thin line with royal icing. The little four-pack of tips you can get at the grocery store just doesn't cut it.
The cake decorating store next to Verna's donut (Verna's Cake Decorating?) was my old go-to but that's closed.
Preferably in Cambridge, Somerville, Boston, Belmont or Lexington.