Map: The price of marijuana in every state

Nationally, the average price of an ounce of weed is $324. But in four states that have legalized or decriminalized pot – Washington, Oregon, Colorado and Alaska -- the price of an ounce of weed has fallen below $300. Oregon is the cheapest, where an ounce of high-quality marijuana goes for only $204, almost half the cost in North Dakota, the most expensive state.