They are exactly what you think they are! Today you get the same thing in a small hand held computer version.
Anyhow, Ebay has too many fees, and then you have to use PayPal which is more fees. On top of that you have to go to the post office and wait in line. I'm not really after making any money. Over the past few years I've run across a couple pilots on NVShooters. I can't remember who they were though. I just thought someone locally might like them for nostalgia.