Costco, often secretive about its merchandising strategy, is selling a Shake Shack-style cheeseburger made with ... a brisket sandwich, a salad and a hot turkey sandwich.

At a Costco trip in May, Bill Wilner stopped by the food court to check out a new special — the $4.99 cheeseburger, 1/3 pound of cheesy meaty goodness on a bun clocking in at only 1,140 calories.

Costco, often secretive about its merchandising strategy, is selling a Shake Shack-style cheeseburger made with ... a brisket sandwich, a salad and a hot turkey sandwich.