John Hardly, many years ago, there was a set of plastic coins available from toyshops in Britain. There were all denominations, available separately, and the plastic pennies were in packs of 10, and cost a shilling. Real pennies were 12 to the shilling.
The caption on the pack was 'teach your children the value of money.'

When I was 'The man from the Pru' I collected from a blind guy. He always wanted all his change in coins, and complained if I hadn't enough to give him all coins.