Update: I found one on Ultima. Logged on at the very last second before maintenance and melded materia for me just before server went offline. Her name's Rinda Drieu. Really polite and pleasant too.

On another note, any idea why Carbonized Material doesn't appear on the message boards? Even when I put up my own farmed stacks they don't appear. Searching for 'carbonized' or 'material' turns up nothing at all.