As far as props go I am limited in space when selling pens because I am a woodworker and scrollsawn items are my bread and butter. But As far as displaying pens I use various racks that I made. Shown some photos. I also use the tried and true single pen stands. I also sell high priced boxes and some lower end boxes and have those set up with pens inside to give suggestions. I also have about 3 or 4 small battery operated turntables set up with featured pens displayed on them. They draw attention. I then lay some lesser value pens up front for people to pick up and try out.
Suggestions: Make yourself available at all times even if you are involved with a customer. Just make some comment about will get to them in a minute and feel free to look things over.
Have a pad available so they can try out the pens in question.
I keep refills of black and blue available. (I do not sell Fountain pens and if you do then you better know what you are doing and saying. Fountain pen users are finicky and usually want what they want)
Have a good display and show people how to operate the pens and to change refills. Make them known they are purchasing a work of art and not a cheap pen so treat it as such and tell them of the dangers of leaving in the heat and cold. Explain your warranty work and you better have one or do not sell. Make sure they are aware. That is about all I have and have fun and good luck. If other pen sellers at your show take a look and get a feel for what they are doing but do not engage in yours is better than theirs type talk. No one wants to hear that.
I stood on a market last year in Belgium, this was my stand.
The plastic stands are not perfect, but they are cheap and display the pens nicely.
Most people liked my price tags, due to it was something different and unique.
Hopefully it helps and you can get some ideas out of it
Our local Macy's shut down and they were selling everything...Cheap. I got two of these stands, one for $60.00 and the other for $56.25. They're probably $200-300 cases. Each case will hold 48 pens or 24 knives. They lock and I will use them as displays at each end of my table with the other type of fixtures shown above in the table middle. Check your local stores that are going out of business, you might find something like these. I do like the ideas shown above, I know I can use these ideas.