I don’t think this one should be very tough to find, but it is anyway. It’s more of a mini-comic than an ashcan, and the story leads into the beginning of the Prime video game for Sega CD. You almost never see these for sale on eBay. I’ve only seen three and they got scooped up pretty fast. I paid $5 for mine.
As far as I know this was the only video game for the Ultraverse characters that was released (a Firearm game was apparently in production for the Super Nintendo and Sega Genesis and the ROM appeared online recently), and it was only available on that system. The game was re-issued and packaged with another game (Microcosm) but that one did not have the mini-comic. I haven’t played it, but I can’t imagine it holds up very well.
I’ve also bought two boxed copies of the Prime-Microcosm game for under $10 but don’t have one of the Prime by itself. I might pay $10 if I saw one.
The Ultraverse went ashcan crazy for a while. The first regular Prime ashcan had a Boris Vallejo cover that was also the cover to Prime Annual 1. I’m not sure what the print run was, but you can find these very cheap all over the place. There is another version with gold foil on the cover and a Comic Cavalcade logo, and these say “Malibu Limited Edition 5,000” where the others say “75 cents.” Much tougher to find.
A friend of mine bought one for me from the Comic Cavalcade website; we also picked up a signed (by Boris Vallejo) version of the same book. But that was a few years ago. I just checked their site and they don’t have them anymore.