I pretty much have to use disposable pens in my line of work, due to potential contamination. I love these; but I pretty much have to buy them at office supply stores. I also have not been able to find refills:
Ultra-fine tip, bold black ink makes for small writing. There's a lot to like with these.
This is the law:
There is no possible victory in defense,
The sword is more important than the shield,
And skill is more important than either,
The final weapon is the brain.
All else is supplemental.
- John Steinbeck