[weasel]

Why not buy a cheap pen and put a Mont Blanc rollerball cartridge in it?

Otherwise you are paying for an expensive holder.

If you're going to buy a Mont Blanc, then get a fountain pen.

I have the Homage a Wolfgang Amadeus Mozart fountain pen, which is a quite small fountain pen, but uses ink cartridges rather than fill from a bottle.

This makes it clean and easy to use - and yes I do write prescriptions with it!