Just have to put in my 2 cents since I've named my three button makers. ^_^ (I have Gus, Jack, and Bruno. They are named after the mice and the dog in Cinderella.)
I bought one from DrDons buttons on eBay, one from Tecre, and I got my 3rd one for Christmas from my sister, which I'm sure came from Tecre.com. Tecre.com has the cheapest prices for the button makers and supplies that I've found, and they have super good customer service. So far every time I've asked a question I've gotten an answer.
You can also send off for their catalog, which is really thin and doesn't have prices listed, though you can see them on the price list that comes with it or on their website. I just like to look at them and pick out which ones I want to buy next... My dad doesn't understand, but I tell him the buttonmaker catalog is just my version of a victoria secret catalog.