The Fisher Space Bullet Pen Price $15 USD
I have three (3) Fisher Space (Bullet model) Pens and I like them. Actually they write like a Bic pen which is OK. Uni-Ball and Pilot write much better/smoother. I love the idea though: A pen that can write under any weather condition (freezing cold, extreme heat), underwater, upside down, and in space (zero gravity).
My pens are still writing but I heard the ink does run out and when close to running out the pen skips badly. Since each refill of ink costs $5 USD through their website I don't think I will be using my Fisher Space Pens after they run out of ink. Maybe my pens won't run out of ink and that will make me a happy man in Heaven.
Note: This pen is small and that makes it a little uncomfortable for people with large hands.
Many, many people love these Fisher Space pens and so I think you should get one just to check it out. The Fisher Space Infinium Pen (below picture) is a $100 - $150 USD pen! I will definitely not be buying one of those.