(20)to sanction the purchase of any article of foreign manufacture the value of which does not exceed Rs. 250 but a District Education Officer has power up to Rs. 500-(a) where the article is already in India at the time of the order or is already in the way out and its price and quality are not unfavourable when from the Stores Department or (b) in cases of emergency or when inconvenience to the public would be caused by waiting to obtain an article through the Stores Department or when, owing to the greater promptitude of supply, economy can be effected by purchase in India;
