Before It's News lists a very small number of banks that sell gold coins. The gold coins available are the American Buffalo and the American Eagle bullion coin.
Gold coins are more commonly purchased from private businesses that specialize in precious metals coins and bullion. For example, CMI Gold & Silver is one of the oldest and biggest gold and silver dealers in the United States. More recently, a number of online stores have appeared that specialize in the precious metals markets. Kitco, Provident Metals and Apmex are some of the largest online markets that offer gold coins and bullion for sale.