Interest and special damages: courts may award interest to seller or buyer absent contractual rate, with specified accrual dates. Parties retain the right to recover interest or special damages where recoverable by law and to recover payments if consideration fails. Where no contractual rate exists, the court may award interest on the price at a rate it considers fit: for the seller in a suit for the price from the date of tender or when the price was payable, and for the buyer seeking a refund from the date payment was made.