How much money is an 1849 Liberty Head double eagle replica 2012?

Since it is a replica, it has absolutely no collector value. However, depending on what material the coin is made of it might have value for scrap. If the coin was made of 90% pure gold like the original, it would be worth ~1600. If such a coin was made in 90% silver, it would be worth ~$20. However, chances are your coin is made out of gold plated copper, nickel, or some other near-worthless metal and is only worth a couple of cents.