No such thing as a ''Tactical Pen". Tactical refers to actions (tactics) not items (unless you are referring to bombardment- ie. tactical nuke). What is refered to as a tactical pen is in fact a REINFORCED pen that can be used as a kubotan or a stabbing implement. Sometimes they have built in glass breakers...basically a tough a@@ed pen. I have 25 different ones as I was trying them out. They were given to me or I bought them. I do not have money to waste but people ask me about them for multi duty work and I wanted to know (I teach people that want to learn kubotan work). Look for something no more than 20 bucks or so and made how you like it- there are many to choose from and most of them are t3 or t6 aluminum and will be sturdy enough for any desk job. TSA is not very concerned with them so you can take them on a plane no problem as well as most other places. Anything with a blade or especially one that is a zip gun is verbotten everywhere and not CCW legal. I like well made writing instruments. Most of them use fisher refills or parker ones and those are pretty good.
Any good, sturdy made pen can work as a kubotan so you don't have to go out of your way to get one. Ones like the Benchmade and others I find way overpriced for what they are. Although, there are those that spend hundreds on a Montblanc or something so I can't say.
The origional bic stick pens made in the USA with the brass tips (that they shot into plywood from a gun in commercials) used to be my favorite edc pen. They were cheap and tough as anything less a steel body pen of the day. They wrote well too.
I have always been of the mindset that the most dangerous weapon is the mind. What the mind can make in an emergency is what will become the weapon of the moment. I could use a pencil and a piece of paper to my advantage in a fight to the death. It has to do with HOW (tactics) it is used. So there you have it.