These particular ones are done through J!nx. I've heard a few people say they've seen the poster in places like Wal-Mart and Hot Topic, and wanted to let everyone know this isn't a case of me being ripped off.
Minecraft Creatures Poster
Career Opportunities Shirt (available as standard, premium, women's fitted, and youth) - no, I don't know why they decided to make it yellow :/ , no, I can't do anything about it
Minecraft Party Shirt (available as standard, premium, women's fitted, and youth)