Costco's new roast beef sandwich costs as much as 6 of the retailer's hot dogs

• Costco's food court is known for cheap fast-food staples such as $1.50 all-beef hot dogs.
• A Reddit post went viral after someone posted a picture of a new menu item.
• But some are balking at the price of the $9.99 roast beef sandwich. 

Remember the uproar when Costco introduced a $4.99 Shake Shack-style burger in 2017? Many hard-core warehouse fans complained it was too expensive for Costco's food court, known for cheap fast-food staples such as $1.50 all-beef hot dogs and $10 whole pizzas.