I believe this is the most expensive piece of aluminium on the planet. 
There are other rarities (such as the German coin Kreuzer mentioned, the Vichy France 1944 small C variety, the 1950 Hungary 10 filler, the 1908 East Africa ˝ cent, and so on) that can be definitely worth your while looking for. That being said, countries use aluminium in their coins because it's cheap and plentiful, so as a general rule most types of aluminium coins are cheap and plentiful.
There are other rarities (such as the German coin Kreuzer mentioned, the Vichy France 1944 small C variety, the 1950 Hungary 10 filler, the 1908 East Africa ˝ cent, and so on) that can be definitely worth your while looking for. That being said, countries use aluminium in their coins because it's cheap and plentiful, so as a general rule most types of aluminium coins are cheap and plentiful.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis




















