Sale of Goods Ordinance

(1)
The price in a contract of sale may be fixed by the contract, or may be left to
                be fixed in manner thereby agreed, or may be determined by the course of dealing
                between the parties.
(2)
Where the price is not determined in accordance with the foregoing provisions,
                the buyer must pay a reasonable price. What is a reasonable price is a question of
                fact dependent on the circumstances of each particular case.