> I don't believe it's legal for a company to change their contract... IANAL, but that's breach of contract. To amend the contract, both parties have to assent

> I don't believe it's legal for a company to change their contract... IANAL, but that's breach of contract. To amend the contract, both parties have to assent. That's why you get those "terms of service" updates that always mention, "and if you don't like the new terms, here's how to delete your account," since your usage of the service constitutes assent to the terms. Purchasing a good is different, it's more bilateral because both parties are still responsible after the initial exchange for delivering on their promises. So if your check bounces, you still owe them, and if the goods are junk, they still owe you. The tricky part here is figuring out what the contract is. When you purchase goods in the US, the framework of the contract you're engaging in is laid out by the Uniform Commercial Code, if you want to look that up. Costco has a satisfaction guarantee[1] and they will refund your money but there's an asterisk: "*Limitations apply. See the membership counter or Costco.com for details." I couldn't find anything more on their site. A "guarantee" has a legal meaning[2]: > 4) a promise to make a product good if it has some defect. So I think it means a customer would be required to explain why he's unsatisfied with the goods, in what way they're deficient. That someone bought too much TP doesn't make it deficient. [1]: https://customerservice.costco.com/app/answers/detail/a_id/1191/~/what-is-costcos-return-policy%3F https://customerservice.costco.com/app/answers/detail/a_id/1... [2]: https://legal-dictionary.thefreedictionary.com/guarantee https://legal-dictionary.thefreedictionary.com/guarantee