Not sure if they'll have the size you need; but arcade machine controls come to mind:
http://www.happ.com/pushbuttons/pushbuttons.htm
http://www.happ.com/pushbuttons/5700043x.htm
They don't come cheap, though!
Not sure if they'll have the size you need; but arcade machine controls come to mind:
http://www.happ.com/pushbuttons/pushbuttons.htm
http://www.happ.com/pushbuttons/5700043x.htm
They don't come cheap, though!