Alko Office Supply, a small Berkeley store, is penny free: If you pay cash, prices are rounded down to the nearest nickel. I have never seen this anywhere else nor had the store clerk I asked. They thought of it themselves, she said. Farmer’s market prices are always rounded down to the nickel or dime, in my experience. Here and there I have made small credit card purchases (< $20) with no signature required. Addendum: Wikipedia entry on penny elimination. A penny protester.