Money Are half-sheet cakes back at Costco? There are reports the popular cakes are back at some clubs July 22, 2020 Kelly Tyko, USA TODAY Comments Off on Are half-sheet cakes back at Costco? There are reports the popular cakes are back at some clubs Are Costco's half-sheet cakes back in stores? Months after the popular cakes were pulled, there are reports that they are back in some locations.