3 things Costco shoppers should know before buying gold bars

• Costco sells an estimated $200 million worth of gold and silver bars per month.
• Gold expert Taylor Huff says with the popularity, some buyers might not know what to expect.
• Huff recommended three things Costco shoppers should keep in mind when buying gold.

Gold and silver bars are some of Costco's hottest items this year, with the warehouse club selling through its supplies to the tune of $200 million a month.