2.25" (55mm) round buttons.
All you need to do is select your quantity and purchase. I'll email you for your design. I'll then send back a mockup for your approval and then I can go into production (5-7 days after your approval). This price does not include any design work. Please contact me for quotes on that. Or if you'd like a template to work with, I can send one over.
I use professional printing for my buttons, resulting in the best colours and resolution possible.
My buttons are manufactured by me here in downtown Toronto, Canada (local pickup is available).