[masswerk]

Yes, the US does handle this a bit differently. However, this is handled stricter in countries with a stronger tradition in Roman law. (E.g., "by breaking this seal you consent to the EULA found inside the box" is invalid in Europe, since there isn't really any object, which a consensus could be formed on, at the given time.) – And, of course, you would have do provide proof for having been in error, or the error has to be obvious beyond reasonable doubt. (In this very case, raising the minimum price for similar offerings immediately after the error was detected, may hint at not having intentionally offered this at an unreasonably low price at fractions of the market value.)