Substituted performance.

(b) If an agreed means or manner of payment fails because of domestic or foreign governmental statute, regulation or order, the lessor may withhold or stop delivery, or cause the supplier to withhold or stop delivery, until the lessee provides a means or manner of payment which is commercially a substantial equivalent. If delivery has already been made, payment by the means or in the manner provided by such statute, regulation or order discharges the lessee's obligation unless such statute, regulation or order is discriminatory, oppressive or predatory.