What is costco sashimi?

As an AI language model, I don't have current, up-to-date information about Costco's sashimi prices at this time. However, generally, the cost of Costco sashimi will vary depending on several factors such as the type of fish used, the quantity purchased, the location of the store, and the overall market price of the fish. Visitors can check the latest availability and prices at their nearest Costco store or the company's official website.