Frederik writes to me:
In the classifieds on the web of the daily Iceland newspaper Mbl, you find hard currency for sale (US dollar, Danish kroner, and Euro) ranging from USD 300 to USD 12000. With the breakdown of the official exchange rates, the market has emerged.
The article is here, in splendid Icelandic. Just imagine using classified ads to buy foreign currency; I don’t see any market on U.S. eBay but maybe I just don’t have the right keywords.