What is tres leches cake costco?

As an AI language model, I don't have live information on the current cost of tres leches cake at Costco. However, it's usually priced around $15-$20 depending on the location and size of the cake. The cake comes pre-made and is soaked in three types of milk (evaporated milk, condensed milk, and heavy cream) which give it a moist texture and rich flavor. It's a popular dessert option for parties and gatherings due to its delicious taste and ease of serving.