Most of the time print minimums exist because there's a cost for the printer to run the job at all, regardless of size, and that minimum is the lowest amount of products that doesn't sound insane per item. I used to work for a printshop and we had no minimums, but if you only wanted 1 business card, that business card was going to cost like $50+. You could buy 150 for cents more than that because all you were paying for was the setup and the job happening at all. The paper and ink cost wasn't even a factor at that size.