Costco sells hundreds of millions of dollars' worth of gold and silver each month. There are two ways to buy bars and coins ...

First, Costco sold gold bars to its members looking to invest in more than bulk household purchases. Now the warehouse retailer is selling silver coins too. Costco began selling 1-ounce 24-karat gold ...

At the store where everything is sold in bulk, more precious metals are being sold as Costco adds platinum to its lineup. The company sold more than $100 million in gold bars in a three-month period ...