It's actually $5, kinda sorta. And they're combined. As far as I can tell, it would be legal for a coin dealer to do so (up to $25) if the purpose if for legitimate sale to collectors outside the United States.
(2) The exportation of 5-cent coins and one-cent coins carried on an individual, or in the personal effects of an individual, departing from a place subject to the jurisdiction of the United States, when the aggregate face value is not more than $5, or when the aggregate face value is not more than $25 and it is clear that the purpose for exporting such coins is for legitimate personal numismatic, amusement, or recreational use.
I do remember years ago when my high school chemistry teacher demonstrated the metal content of (then) new pennies with a copper cladding over zinc. He scratched the copper until zinc was visible, and dropped it in hydrochloric acid. It started bubbling and after a long enough time he fished it out and showed that it was basically a shell of copper. I've also used squished penny machines. These are legal up to a point.