Or you just move to a model where sales tax is required to be baked into the price that you see. Then make the items all cost multiples of 5 cents. You can stil

Or you just move to a model where sales tax is required to be baked into the price that you see. Then make the items all cost multiples of 5 cents. You can still use single cents for checks, credit, or whatever. The only industry I can think of that gets left behind is gas stations, and then only if you post-pay in cash (or overpay with cash I guess). And they already tend to give a discount for cash, so I think rounding off to the nearest nickel would be a pretty acceptable outcome. As a bonus I don't have to constantly explain to the kids why the $10 thing they want actually costs $10.80, or $10.85, or $10.72, or $10.97, or some other amount that differs by state / county / city.