Grace roof detail membrane

Hello, Does anyone know of an online supplier that carries Grace roof detail menbrane 9" width rolls?

My local l**wes and HD do not carry it anymore.
I want it to put around my chimney under the flashing when I redo it. This product would be great for that as it is about $75.00 than buy a whole roll of ice and water sheild and cutting it down. I’m just having trouble finding it anywhere.

Any help would be appreciated. thank you