It has also been found that the better autopen machines can be used to sign items like bats and balls. There are two models of these autopen machines: The M80 costs about $3,000; the M350 costs about $9,000; and an extended service agreement costs about $500. A strong claim of this article is that autopens are used much more than suspected in the entertainment industry. Much of Mr. Martin's information has come from a secret source in a manufacturer of autopen machines. Many stars and/or management agencies own these machines themselves.