From The Economist:
THE street price of cocaine varies hugely across the world. No surprise that it is cheapest in Colombia, the world’s biggest producer of coca: at $2, a gram costs less than a Big Mac. Geography is an obvious price factor. The farther away a country from the main producers in South and Central America, and the more isolated it is, the higher the cost to traffick there. In far-flung New Zealand, a gram costs a wallet-busting $714.30.