They were retailer incentive lithos for the comic book. as far as I know only comic book retailers could get their hands on them from Dark Horse and there may have been requirements like ordering so many of the comic, etc so its not like all retailers would of gotten one. There definately is not alot of them out there but I can't remember if there is a stated number or not. I'm sure someone on here knows, the litho has been discussed in the past.