ARP Refrigerator Protection

I started out to buy it when I saw Pianatuna's recommendation but the $200 price stopped me. It just seems like a lot for a device that flips a switch off when the temperature rises too high. A $5 thermostat can accomplish that. It seems to me it should be possible to make an electronic device with $5 worth of parts that turns off upon sensing high temperature and does not turn it on again until cool AND level, or flashes a light to indicate a person needs to turn it on when ready. Must I make my own to get a reasonable price?

I don't blame the ARP guys; they probably have horrendous insurance and legal costs when fridges fail for whatever reason.

I am very careful about levelling and turning off the fridge when not level and live in the cool north.