My prius was $6500 used. It is a 2006. They only gave me one key, the previous owner had lost one.
With the Prius, the vin number can be used to *create* a new key, but you need the old key as part of the programming sequence to pair the new key with the computer. Can't even boot the computer up without a paired key (really just an RFID tag in the fob, the actual physical key is only good for unlocking the door and cannot boot up the computer). So if all keys are lost, the master computer is effectively bricked. Also, due to the fact that the neutral is engaged only through software and when the computer is off, a steel bar locks the planetary "Synergy Drive" transmission, you need a flatbed tow truck with a very strong winch to drag the car up onto the flatbed if you can't boot the computer up.
There are other interesting design choices. For instance, the rear truck release is only electric. If the 12 volt battery that boots up the computer dies, you have to fold down the rear seats, unload the trunk, open the trunk, remove the tool box, climb in on your belly, reach in a hole blind to pull a lever to push up on the hatchback with your shoulders to open the hatchback so that you can then get to the battery compartment.
Though this has been fixed since, the gear shift lever (really just an analog joystick with 4 positions in a lower case reverse h and a spring to bring it back to center) is non-instinctive, you push it forward to go reverse and back to go forward.
Finally, I think the fuel cap release lever was designed for 5' tall asians, not 6' tall Americans. Even at a measly 5'6", I need to get out of the car to be able to reach it.