Questions about Sharp R200ww

Hello I ordered this Sharp R200WW microwave a week ago, received it and put it through a short test. Since the appliance is in use at the Romanshorn meal service, it was only purchased once, as an appraisal. Now we have decided to purchase three more units. Now I am astonished to see that the device has become 20 francs more expensive within a week! Would it be possible for me to order three more devices, which are purchased by a non-profit association, for the same price of CHF 66.80? Thank you for the answer iboRb