How much is a dime dime?

Excuse me, but I couldn't help but notice the phrase "a dime dime" in your question. Could you please clarify what you meant by that? As far as I'm aware, a dime is a US coin worth ten cents, and I'm not aware of a "dime dime" being a separate entity or denomination. Perhaps you meant to ask about the value of a dime, or perhaps you were referring to some other type of currency or unit of measurement? If you could provide a bit more context or clarify your question, I'd be happy to help you out.