The last-ever penny will be minted today in Philadelphia

We eliminated pennies in Canada in 2012 and the transition was a non-issue. The vast majority of retailers would round cash transactions to the nearest $0.05, but a few would round down to the nearest $0.05 in favor of the customer. https://en.wikipedia.org/wiki/Withdrawal_of_low-denomination...

Canadian cash is better than American cash in several ways: No penny, durable polymer banknotes (instead of dirty wrinkly cotton paper), colorful banknotes (instead of all green) that are easy to distinguish, $1 and $2 coins in wide circulation (instead of worn-out $1 bills).

The linked article raises a few problems that the US could have with that solution:

> Four states - Delaware, Connecticut, Michigan and Oregon - as well as numerous cities, including New York, Philadelphia, Miami and Washington, DC, require merchants to provide exact change.

> require merchants to provide exact change

All the items in my dad's farm shop were priced so they came out to a round dollar amount after tax, and that was 40 years ago.