Given the year im gonna guess its a transponder key - no theyre not cheap. No most locksmiths dont keep any transponders other than late model falcon compatibles.
My GTR key is just metal so it wasnt an issue - came with two spares anyway so i havent had to. (I used to work reception for a locksmith company here in ballarat)
can i see a picture of the key?
Chalk and cheese but i had to order a pre-cut key for my N16 pulsar while i was still working there, bought it cost price, still 100 dollars. Yes, for a PULSAR XD
basically it needs to be programmed to your ECU as well if this is the case, and all this does add up in terms of $$$.