I had never heard of these before, which is odd, because the combination of comic books and trading cards (specifically, mini comic books the size of trading cards) is something that would be right up my alley when I was a kid. I got a couple of these in a lot of trading cards on eBay the other day and am simply blown away! They have a copyright date of 1981. Again, I would have killed for these at 8 years old.
Anyway, I scanned in the two that I have (I'll post the other one later), and am posting the Incredible Hulk right here, right now!