It is then prescribed by clause (3)-- "No person shall sell a bulk drug at a price exceeding the price notified under sub-paragraph 1, plus local taxes, if any payable: provided that until the price of bulk drug is so notified, the price of such bulk drug shall be the price which prevailed immediately before the commencement of this order and the manufacture of such bulk drug at a price exceeding the price which prevailed as aforesaid