When I taught tertiary anatomy to sports science students. The school’s stationary cabinet was a box of lost pens that the cleaners added to. The school wasn’t great. Rather than buy new pens, we were to take from the box. I knew I wasn’t being renewed next year so I came in on the holidays and took every four pen in that box. About fifteen of them. It’s seen me good for for pens for about 13 years now. I still have a bunch kicking around. Mostly green/red left, but I use those to mark my ToDo lists with completed and delayed entries.

I wish they sold cheap refills for the 4-pens but when I looked I could only find ones around the same cost as a new pen.