Superman Gold and Silver Coins
A few decades back I purchased a couple of collectible superhero coins, and now you can have a go at it if you like.
The Royal Canadian Mint is releasing seven different Superman coins in extremely limited editions; some of the coins contain gold and the rest contain silver. The Superman images on the coins are from the chronological extremes of Joe Shuster's Golden Age drawings and Jim Lee's Modern Age artwork (so fans of Curt Swan or Wayne Boring or Neal Adams may choose to sit this one out).
Full details are available over here. The article indicates that one of the seven coins is 80% sold out in advance of its striking, so you should probably get right down to business if you are so inclined.