you have to consult your 兒科診所 if they can help you..... but if the clinic will make profit by this, then will be almost the same price in the supermarkets.
I ordered from my 兒科診所 since the Dr. is my close relative; and the nurse have good relationship with the senior consultants of Gerber, Heinz and Maeil, that she just did me a favour to order in a lower price in bulk However, I just ordered once from each of the above company as i know it's quite trouble to 搭上搭 to order....