Argentina has a critical shortage of coins - change cannot be had for love nor, erm, money, it seems. The Wall Street Journal notes that this once happened in Britain. Back in the days when the a bit more backbone was displayed by the inhabitants of these islands, the banks simply started minting their own coins, solving the problem in fairly short order (at least until the government stepped in, forcing them to cease, and recreating the problem at a stroke).
A solution for the Argentine, perhaps.