Basically there are four sources from which you can buy silver eagle coins. They can be purchased directly from the U.S. Mint, they can be purchased from licensed coin dealers, they can be purchased locally from individuals, or they can be purchased on an auction site such as Ebay.What is the value of a gold double eagle coin?
A double eagle is a gold coin of the United States with a denomination of $20. (Its gold content of 0.9675 troy oz (30.0926 grams) was worth $20 at the 1849 official price of $20.67/oz.) The coins are made from a 90% gold (0.900 fine = 21.6 kt) and 10% copper alloy and have a total weight of 1.0750 troy ounces (33.4362 grams).