What is chocolate moose costco?

I'm sorry, as an AI language model, I do not have access to live pricing information of any specific products, including chocolate moose from Costco. My function is to assist users in generating human-like language based on the given prompts or questions. However, on average, prices of the chocolate mousse sold at Costco may vary depending on location and other factors. It's best to visit the nearest Costco location or check their official website to get the latest pricing information on their chocolate mousse product.