I suppose, that they will not be very glad to give away information to someone, who is thinking how to make them a cheaper concurence

As far as I know, for the initial cooling down will be needed some sort of container for the body, filled with ice. So, you will neeed also some sort of ice machine
For the cryoprotectant transfusion will be need an artificial heart pumping system, such as those, that are used for the heart operations. Further will be needed another container, that will be now individual for the patient, that will be cooled down with liquid nitrogen and will be placed in a dewar.
So, consumatives are: the personal metal container, the individual dewar, the ice, liquid nitrogen and the cryoprotectant. Their cost is for patient, and I don't see a way for that to be avoided, as a cost for each patient, right? Are cryoprotectants sold somewhere and what is their cost?