[Fierce Allegiance]

I think I have about a half-billion of the things in a drawer at home. Some of them work. Some of them leak.

[Calvin Locke]

Well, iirc, Zaphod Beeblebrox has a profitable second-hand Biro business. Maybe he's included Bics?

FWIW, stick pens have more ink than retractables.
(One of the generally useless bits of info I picked up in B-school.)