Internet Pork is the online home of Pork Magazine: A Bit Street & A Bit Sweet. It’s an actual paper publication out of Eugene, OR and, amongst other things, offers button-making via Blitzkrieg Buttons. The 1.25″ buttons are only 30 cents each (before shipping, which I haven’t found the charges for yet). The 2.25″ buttons are 50 cents each. Note that in both cases that’s for an order of 100.