What is costco chocolate mouse?

As an AI language model, I don't have current access to the latest prices and information about Costco chocolate mouse. However, typically, Costco offers a variety of chocolate mouse products from different brands and manufacturers. These may come in different sizes, flavors, and types. The prices may vary depending on the brand, quantity, and location of the Costco store. Generally, customers can expect to find high-quality chocolate mouse products at reasonable prices at Costco. It is always best to check the product label and the current price at the store before making a purchase.