Hello. I am trying to start a little business for engraving dog tag metal and plastic. All the dog tags will be given free to anyone that adopts an animal at a shelter. I would like to be able to engrave the name, phone number, etc on a plast or metal pet tag. What is the best machine to do this, I need something small compact and just to get the job done? I am looking at the lowest cost to start out with. What are my options? Willing to purchase a used machine.