In my first post about notebooks, I mentioned a green Army-issue notebook that is roughly the size of a moleskine, 5.5” by 8” and 92 pages. I couldn't find them online at the time, but now I have: the Federal Supply Service item 7530-00-222-3521. Price? $2.33 each, shipping included. Moleskine notebooks run $9.60 and up.
Add a piece of duct tape and you've got a pen holder - wrap it sticky side out around a pen to form the holder, place that against the spine of the notebook, and wrap another piece of duct tape around the whole notebook cover (sticky side down) to hold it in place. Too easy, and it makes a nice contrasting stripe around the cover!