((a)) ** .—** Notwithstanding any other provision of law, it shall not be unlawful for a seller of food and grocery products using a uniform zone delivered pricing system to compensate a customer who picks up purchased food and grocery products at the shipping point of the seller if such compensation is available to all customers of the seller on a nondiscriminatory basis and does not exceed the actual cost to the seller of delivery to such customer.

((b)) ** .—** It is the sense of the Congress that any savings accruing to a customer by reason of compensation permitted by subsection (a) of this section should be passed on to the ultimate consumer.