As Casiopea said, "ain't got no" is not standard English, and the use of it would be inappopriate in a classroom or business situation. However, it is commonly used by many folks, and since you wanted some examples:
"Can I borrow a dollar?" "No, I ain't got no money."
"Leave me alone, I ain't got no time for your silly questions."
Don't ever tell your English teacher where you got these examples! LOL