I know of 2 boardies, including myself, who have the special missions Zeck sketch, but neither are for sale. I came across mine on ebay for $15 bin about 8 years ago (I'm not sure it was $15 but it was cheap). I didn't know it even existed before that and it was very random that I came across it. One will show up, just keep looking...The others on your list are too modern for me. I started out collecting the first IDW series but then there were too many joe titles and variants every month and I lost interest.
Good luck with your search...