While Australia, New Zealand, and Canada have all done away with their penny, the United States, Great Britain, Euro-zone, and Japan all see at least some use for retaining their lowest unit coin despite the eroded value after decades of inflation. Specifically, 1/100th unit coins are needed to make change due to government sales taxes. One interesting thing I learned from the story is that Japan has "100 Yen stores" the same way we have "Dollar stores" in the US. There are currently 38.8 billion one-yen coins in circulation.
Gold sales in Japan are also up due to the coming sales tax increase: