Links to Art Supply Sources On-Line
They have the Zig Pens. I like Kuretake Zig Letter Pen CocoIro and use the Kuretake Zig Letter Pen CocoIro Pen Refill - Super Fine - Black: Sadly these pens are not waterproof. Let me know if you find a source for a waterproof version of this pen as the nib is very flexible.
I like the Grip 2001 Pencil Eraser-Tip
Faber-Castell Grip 2001 Pencil with rubber tip.
Excellent calligraphy pens, inks and papers
RIO GRANDE -