Just because it is Costco does not mean one should buy whatever is offered. Be aware when buying a taxable item, the tax is charged on the original amount and not on the labeled discount price. Return policy is simple and excellent. Just because an item is available for a period of time, does not mean it will be there when you like to buy it. It may be discontinued, never to return. Flooring, clothing, a particular bread type etc. etc. are some examples.
Are you the owner of this business?