@ABC Gifts and Awards makes most of the buttons for people on here. Gene is a great person to deal with. 60mm is the size to go with on buttons. They can also print on the rolling edges too, but I think the minimum is 10 for those. Without the edges I don't think there is a minimum, but you'd have no problem selling the buttons on here. I'd be in for a dealer button or two if you ever have one made.