What is rosca de reyes en costco?

As an AI language model, I don't have access to the current inventory of Costco stores. However, Rosca de Reyes (Kings Cake) is a traditional Mexican pastry consumed on January 6th to celebrate the Epiphany or Three Kings' Day. It is typically decorated with colorful fruits and contains a small plastic baby figurine hidden inside, which represents the baby Jesus. Whoever finds the baby in their slice of cake is believed to host the next feast or party. Costco, as a major retailer with many stores in Mexico and the US, may sell Rosca de Reyes during the holiday season.