the space pen wallets are on the fisher web site and probably others as well, [maybe less expensive on other sites].

http://www.spacepen.com/usa/index2.htm

[wallet is in the specialty area of the website]
I have a bullet pen in a small leather wallet with a note pad and a few slots for credit cards that was sold by T. Shipley on their web site, but it is no longer available. I thought I had lost it, and it was lost here in the house for about a year, but just recently found it -- now have the bullet pen in my psk where it belongs anyway. But it was handy in the leather wallet too, may have to get another bullet pen for that one.