When a wholesaler sells cigarettes and/or tobacco products to a sub-jobber, the former shall use the basic cost of cigarettes and/or tobacco products (which is the factory list, less all discounts except customary discounts for cash, plus the full face value of any stamps which may be required by any cigarette tax act of this state now in effect or hereafter enacted) in making such sales. The sub-jobber, upon resale to a retailer, shall be subject to the provisions of Section 4 of this act.¹