Hi Steve, this is where I found the ones that many here use in their photos. http://www.usadisplay.net/pen.htm
Plexi Pen Stands - Plexi-PENstands...ONLY $12.75 each - Model PN-STND.
I just received mine and have not taken any pictures with it yet. I like the angle the pen sits at.
Scroll just a little ways down and you will see them. There is a green pen and a dark blue pen sitting in two of the stands.
For me, I'll buy one for 12.75 rather than go out and buy a piece of plexi, cut it, round the corners, sand the edges, then heat it and hopefully bend it to the way I want it. I would screw that up big time or it would take me a couple of tries to get it the way I wanted it.[V]