Vendors to furnish prices

The vendors of any price-controlled goods sold whether for cash or credit shall in every case where the sale is by retail, forthwith furnish the purchaser with a bill on which he shall set out a full description of such goods, the quantity sold and date of such transaction, the name and address of the vendor and the purchaser, the price at which the goods are being sold, and where the sale is by wholesale the maximum retail price at which such goods should be sold.