It’s hard to call these comic books, but they are comic-book sized so let’s just throw them in with the rest. These look like the kinds of things you would take to busy conventions and try to get as many signatures from the artists and writers as possible. Inside are small bios and pictures with a box underneath for them to sign.
Mine are still blank; I picked these up in auctions somewhere. It would probably freak out one of the old Ultraverse creators if I gave them one of these to sign in San Diego this summer.
They’re not particularly easy to find, but they’re always cheap. Somebody might try to charge a little more if it had a lot of signatures inside, though.