Get a cheap rock tumbler from a place like Harbor Freight and some course aquarium gravel. Put a cup of water in with 1/4 drum full of coins and 1/4 of gravel and let 'er rip overnight. (Do not overfill the drum).
Good enough to pass to a cashier in the morning.
America was founded by tough hell-raisers. Rugged citizens who evaded taxes, spoke strongly against tyranny, grew tobacco, brewed beer, distilled spirits, and smuggled weapons. And it will be saved by those same types of citizens.