Several years back Canada had put out a series; $20 for $20 series with the spin off $50 for $50 and $100 for $100. The $20 for $20 started a controversy when a local chartered bank refused to accept the $20 coin in exchange for a $20 bill. The court ruled the coin as legal tender so the bank had to accept. I wish I knew which bank it was, I'd buy them.
Then there was a clever American who bought the $100 for $100 coin from Ebay for a few dollars above spot and postage and walked across the border from the US into Canada and asked $100 CAD at the Canadian bank for the coin and made a tidy profit.