Although there is no federal law related to this, the Federal Trade Commission calls a fantastic advertised offer that is later told is a mistake, “bait-and-switch” scheme, also referred to as "bait advertising,” which is illegal. Laws against false or deceptive advertising require an intent to deceive by the advertiser. If a company can prove that an advertised price was simply a mistake, then it's not false advertising. But still, promoting one sale price and charging something else degrades the image of the seller. States like California do have some business and professional codes regarding displaying incorrect pricing. It says that if you find a pricing error at your local store in California, they have to give it to you. If they don’t, they’re breaking the law.