 These are made with the same titanium grade that was used for the OEM keys . Nissan stopped offering them with the Z's on Nov/1994 .
They were still available at the Nissan dealers for $30-$40 back in the days .And when they were discontinued the prices just became ridiculous :-) You can cut the keys at any hardware store or locksmith that has a key copying machine. Just check with them first if they are willing to do it for you since they are titanium so they are a little bit harder then any brass or aluminum key. After cutting the keys you would have to clean up the rough edges by yourself since they wire brushes are not able to do the job at many locksmiths, Here you can see the difference between the keys in the red circles,in the key shank and there is also a small difference in the "300zx" logo . 
$30 shipped per key.
Or $39 shipped for a key and key chain. (Z logo, 300ZX logo or S30 Fairlady Z logo)
Paypal address
Arubadavez@gmail.com
Available colors for the 300ZX lettering:
Black, red or plain Key chain versions 
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Titanium keys $30 shipped or $39 shipped for key+key chain - 
