Costco (COST) is slinging a lot of gold bars as prices for the yellow metal continue to surge. Sales of gold were up "double digits" in the most recent quarter, Costco CFO Gary Millerchip told analysts on its earnings call Thursday evening.

Costco shoppers can’t get enough of the discount chain’s gold bars despite—or perhaps because—gold keeps setting record prices. Costco Wholesale—mostly known for jumbo packs of paper towels, bite-size food samples,

Costco's gold bars are proving to be one of this season's hottest items, and Canadians are rushing to get in on the action.