Costco had 100-gram gold bars for $7,600. They sold out in less than a day.

• Costco's largest gold product is a 100-gram bar from PAMP Suisse that last sold for $7,599.99.
• The jumbo-sized bar was briefly available this week, but sold out in less than a day.
• The quick sellout shows just how strong demand still is for Costco's precious metals business.

Costco has been selling gold and silver at a rate of $200 million per month, per analyst estimates, and it's showing no signs of slowing down.