Depending what you want the key for, Hy also offer a plain key without buttons that will open and start the car (I got one for our Getz). Apart from having no remote function, by dint of that, it also cannot arm or disarm the alarm and immobiliser.
What this means is that if armed by the remote key (locked) it will sound the alarm when you open the car but will be silenced as soon as you start it. Further of course, if you lock the car with the limited key no alarm will be active.
It works well as a second backup key and was from memory about $250 and is by mine, good insurance.
You can also get a plain key cut that will open the car but do nothing else (except set off the alarm), however this would be invaluable if you somehow lock the other key inside.